You need to create a supplier in order to tie a supplier shipment to it.
A supplier is a normal WooCommerce User like a customer just with the attribute Supplier instead.
It can then be selected in the Supplier Shipment screen.
- Click on “Users” on the Dashboard. Then click on “Add New”.
- Fill in user information.
IMPORTANT: Choose if you want the user to receive a notification that you added him as a user. If not so, remove the tick
- Make sure to select the Role Supplier
- Then click on “Add User“
- The user’s account you just added should now appear in the menu.