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Shipping Rule: Enable Specific Carrier Accounts

Specify which carrier accounts can be used to ship orders

Written by Dan Coleman

Updated at October 20th, 2026

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In This Article

Before We Begin Set Up the Rule 1 - Add a Tag Tag Settings 2 - Add the Tag to the Orders 3 - Create the Rule Default Shipment Settings TIP: Filter Your Orders by Warehouse

Postsale gives you the ability to enable specific shipping carrier accounts that can be used when creating shipping labels. This is a great option when you need to limit which carrier accounts certain shipping locations, warehouses, 3PL companies, etc., can use.

In this article, we'll walk through how to set up a shipping rule that restricts a warehouse location to using only the USPS account assigned to that location. It also limits the warehouse to only viewing rates for the selected carrier account.

Before We Begin

If you haven't already done so, it may be helpful to familiarize yourself with Shipping Rules and Tags, as this help article will touch on each of these Postsale features. We will link to additional help articles for you throughout this article so you have a quick reference if you need more information.

Set Up the Rule

REAL-WORLD EXAMPLE

We have a shipping warehouse that handles all of our Fern & Field Goods store orders. We want that location to use only a specific USPS account when fulfilling these orders.

Let's use this example to show how this works. We will cover each of the steps below, but here's a quick overview of the process:

  1. Add a new tag to Postsale that allows us to specify the fulfillment location for orders.
  2. Associate the new tag with the correct orders.
  3. Create a new Shipping Rule that tells Postsale to limit carrier accounts to the specific USPS account when the tag is associated with an order.

Here's a closer look:

1 - Add a Tag

The first step is to add a new tag in Postsale that can be used to identify which location is responsible for fulfilling certain orders. For this example, we will add a new tag named Warehouse that allows us to enter a value to identify a specific warehouse.

  1. Open Settings.

    Settings is shown and highlighted.
     
  2. Select Account Settings.

    Account Settings is selected from the menu.
     
  3. Select Tags from the list of available options.

    Tags is selected in the list of options in the Account Settings menu.
     
  4. Click + Add Tag.

    The Add Tag button is highlighted.
     
  5. Configure the tag like this:
    Be sure to click Create Tag to save your new tag.

    The New Tag window with Display Name set to Warehouse, Key set to warehouse, and Has a Value turned on.

    Tag Settings

    Here are a few notes about the tag settings shown in the image:

    • Display Name: We named the tag Warehouse, but you can name it whatever works for your workflow, like Fulfillment Center, Location, Ship From, etc.
    • Icon: You can add any icon you'd like to help identify the tag within a list of tags.
    • Key: As you type the Display Name, a key is created for you. However, you can change the key if you want. Postsale uses the key to identify the tag in templates or Liquid references. Once you save the Tag, the key can no longer be changed.
    • Has a Value: Make sure this is enabled. It allows you to enter a value associated with the tag that identifies the location. For example, you can enter a value of 1 for warehouse 1, 2 for warehouse 2, and so on.
     
 
 

2 - Add the Tag to the Orders

The next step is to add your new tag to the correct orders. Adding the tag with the correct value identifies which orders belong to which location.

For our example, we will add the Warehouse tag with a value of Fern & Field to indicate that the order is fulfilled by this warehouse. You can enter any value that works for your workflow.

There are two ways to add tags to orders:

  • Manually Add Tags to Orders
  • Import a File to Bulk Update Orders (only available for CSV file import stores)

Here is a quick overview of manually adding a tag to an order:

  1. Search for and select the order you want to add tags to.

    The Fern & Field Goods orders in the Ready to Ship status are searched for and order 4501 is selected.
     
  2. Open the order's context menu and click Edit Order to open the Order Editor.

    The context menu is opened for the order and Edit Order is being selected.
     
  3. Locate the Tags section.

    The Tags section is highlighted in the Order Editor.
     
  4. Click + Add Tag.

    The Add Tag button is being clicked.
     
  5. Select the tag you wish to add to the order.
    In this case, we selected the Warehouse tag we created earlier.

    The Warehouse tag has been selected.
     
  6. Enter the value that identifies the correct fulfillment location for the order.
    For this example, we entered Fern & Field.

    Fern & Field is entered as the tag value.
     
  7. Click Add Tag.

    The Add Tag button is being clicked to save the tag.

    The tag is now added to the order.

    The tag is added and shown in the Tags section of the Order Editor.
     
  8. Click Save Order.
 
 

3 - Create the Rule

The last step is to create the Shipping Rule to tell Postsale:

“Hey Postsale, when an order has a tag of Warehouse: Fern & Field, limit the carrier accounts that can be used for shipments to the Fern & Field Goods USPS account.”

Here's how:

  1. Open Settings.

    Settings is shown and highlighted.
     
  2. Select Carrier Settings.

    Carrier Settings is selected from the list of settings.
     
  3. Click + Add Rule.

    + Add Rule is highlighted and being clicked.
     
  4. Enter a Name that clearly identifies what the rule does.
    For this example, we entered Apply Fern & Field Carrier Account.

    The name Apply Fern & Field Carrier Account has been entered into the Name field.
     
  5. Click + Add Condition and select Condition.

    Add Condition is clicked and Condition is selected.
     
  6. Configure the condition like this:
    1. Field: Warehouse
      Select your tag. It will be listed as r [your tag name] in the Field drop-down menu.
    2. Operator: Equals
    3. Value: Fern & Field
      Enter the correct value for your workflow.

The Add Condition window with Field set to Warehouse, Operator set to Equals, and Value set to Fern & Field.
 

  1. Click Save.

    The Save button is being clicked.

    The condition is added to the Shipping Rule.

    The condition is added to the Shipping Rule.
     
  2. Click + Add Settings under Then apply these settings.

    Add Settings is being clicked.
     
  3. Locate the Eligible Carriers drop-down menu. Expand it and select the correct carrier account.
    For our example, we selected the Fern & Field Goods USPS account.

    The Fern & Field Goods USPS account is selected.

    Default Shipment Settings

    Since we only want to limit which carrier accounts can be used, this is the only setting we need to update, as the Default Shipment Settings will also be applied.

    Learn more about setting up your default shipment settings and how Shipping Rules are applied to your shipments.

     

     
  4. Click Save.
    The new rule is added to the list of Shipping Rules.

    The new rule is shown in the list of Shipping Rules.
     

Now that the new Shipping Rule has been added, any order tagged with Warehouse: Fern & Field will be limited to the Fern & Field Goods USPS carrier account when shipped.

An order with the Warehouse tag is shown in the Orders Grid. The Dock is open and the Rate Selector only shows the Fern & Field Goods USPS account.
 

TIP: Filter Your Orders by Warehouse

Did you know you can also filter your orders using tags? You can. Why not create a filter for each shipping location so it's easy to view all orders for a specific location?

Learn more about Filters and Working with Tags in Postsale.

 
 
 

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