Partial shipment chosen by customer when out off stock

[A G]

Hi, we let customers order products that we don't have in stock. If the customer only has products in stock in the cart, then there is no problem. The same if there are only products that are not in stock. The problem arises when the customer in the cart has a mix, a few products in stock and a few not.

I would like to give the customer the option to decide whether we should send the products that we have on stock and send the rest later or he wants to wait until we complete all of them. There is also the issue of free delivery. Suppose free shipping is $ 100 in our store. If the customer chooses the option of partial shipment, then depending on the value of the two parts, he must add the appropriate amount for the shipment.

Do you know this or a similar module?