transfer sale or partial sale from store to store

Hello. We have been trying to find a solution for this problem: Store 1 gets a customer and a salesman sells 3 items, then salesman takes customer to Store 2 and sells 4 more. Because of time, the entire sale is rung up at Store 2. In order to report sales accurately, we need a way to transfer the portion of the sale or the entire sale back to Store 1. End of month entry would do just fine. Is there a way to do this in HQ? Thank you for your time and attention. This forum has helped us so much.