You can split up a sale such that some of the line items on a sale are sold now, leaving the remainder of the items to be sold at a later date. Furthermore, you can assign one of the sales to Customer A and the the other sale to Customer B. When you split a sale like this you must pay for the portion that is split off shortly after you split it. That is to say, you cannot split an order into two and suspend both portions. Nor can you join two orders into one.