By default, order and shipment status emails display order numbers that include the store ID before the order number. For example, if a customer's order number is 792, and your store ID is yhst-12345678911011, the order number would be displayed as yhst-12345678911011-792.

You may customize what's displayed before the order number in order and shipment status emails, using the "Order Number Prefix" field in the Shipment & Order Status section of Store Manager.

To create a custom order number prefix:

1. In Store Manager, click the "Shipment & Order Status" link, located in the Order Settings column.
2. Locate the "Order Number Prefix" field (Figure 1).
3. Enter the custom order number prefix you wish to use. For example, if you wished to have the word "acme" displayed before the order number (acme-792), enter the word "acme."
4. Click the "Update" button.
5. Publish your Order Settings.
   

Figure 1. Order Number Prefix field in the Shipment & Order Status section of Store Manager.

When configuring order and shipment status emails, if you wish to use the store ID as the order number prefix, you may do so by leaving the "Order Number Prefix" field blank.