How can I integrate with 3rd party inventory system?
If you're using a 3rd party inventory system (like FishBowl Inventory) and BYOB orders can't be imported, you might need to add SKUs to dummy variants.
By default, it's NOT necessary to add SKU unless you can't import orders to your inventory system. The variants generated by us don't exist in your inventory. So there is NO SKU assigned. Otherwise, it may confuse your shippers.
When you're trying BYOB, you should test whether the orders can be imported into your inventory system.