One cliente, multiple products. How to?

Hi, guys. I’m creating a app where I’ll sell for one client various items.

I’d like to create a new screen where I select one cliente in a list and I will just adding new items, with its respective amount and price.
As you can see, now every time when I try to add a new product, it just create a new sale, but I’d like it’d be just in one sale with multiple items inside.

Is it possible? If it is, how to do?
For example in this screen. I’d like just click in the “+” and add a new product bellow!

Maybe you wish to take a look at the Order Capture sample app.


Omg! This is exactly what I need. Thanks a lot! I’ll use this sample then