We do not use this to drop ship. We use it to share stock between stores.

When an item is sold creating an order in the source store causes chaos because it assumes payment of the retail amount to the source.

We would like to be able to enter a cost price for each product / variant and then have a statement or invoice facility so the source store can invoice the destination for the cost price of the items sold. ideally we would invoice each other for all outstanding values monthly.