Yes, it is possible by doing the following steps:

1. Input your customer's order in PoS.
2. You can also assign a customer to that order (optional).

3. Then when you need to start a new order while keeping this one saved, simply click on the menu button and click on orders:

4. From there click on new order and a new order will start for another customer:

6. When you need to go back to your previous customer's order, go back to the same menu and select and load that order: