Items with serial numbers

Add New Item

Go to Inventory-Equipment Settings-Items logical categories

Image: Items logical categories

Click ADD NEW ITEM button

Enter new Item's data and check TRACK ITEM BY SIZES radio button

Click SAVE button

Image: Add new Item

Select item from list to: Check Details, Edit Item, Enter Quantities...

Image: Item Details

Edit Item and click SAVE button

Image: Edit Item

Enter Quantity for each size and click SAVE button

Image: Enter Quantities