There are three ways to add shelves.

Method 1:
Add A Shelf
Click Inventory > Shelves > + Add Shelf > Add Singly



Method 2: Bulk Add Shelves
Step 1:
Click Inventory > Shelves > + Add Shelf > Add in Bulk


Step 2:  Select Warehouse and add shelf information



Method 3: Import Add Shelves
Step 1:
Click Inventory > Shelves > Import


Step 2:
Select Warehouse > Upload File. You need to first download the template, fill out the shelves info then upload.