You have to fulfill the wanted list yourself (aka place orders by going into
your wanted list, clicking "buy all" and having the system select stores/create
carts for you)
Then you place the orders and apply them to the wanted list once they arrive
and you've verified you bought everything; if you want to verify you've
purchased everything without actually having it in your hands, copy the wanted
list and apply the orders to it to make sure you've hit 100% of the parts
needed