Before setting the mapping relationship between shelves and Inventory SKUs, you need to add shelves first. How to add Shelves?
 

Method 1: From Inventory List

step 1: Click Inventory > Inventory List > Set Shelf


Step 2: Click Select to set the shelf



Method 2: From Stock-In List

If the Inventory SKU hasn't match the shelf, you can set a shelf when adding a stock-in list.