You can add the Warehouse Location values sent from your selling channels (like SkuVault or Magento) or from your Product Details Shipping tab to your packing slips by doing the following:
Click the Order Items Header section.
Add the following HTML after the first closing </th> tag (the one containing the "Item" text):
<th align="left" style="width:1in"> Loc. </th>
Click the Order Items section.
Add the following HTML after the first closing </td> tag (the one with the [Sku] field replacement):
Inventory Warehouse Location
ShipStation now provides a method to also print the Inventory Warehouse Location from the Product Details Inventory tab on packing slips. Review the Add Inventory Locations to Packing Slips section of our Internal Inventory Options article for more details.