Selection counter and selection memory

I'm making an app prototype where I have a list of LP's. The user can select more than one LP.

1. At the bottom of the screen there needs to be a menubar which gives the amount of selected items. How can I do this?

2. I also want that menubar to pop up and show a list of selected LPs (text only is sufficient).

Basically i want a shopping cart.

3. On the next screen I want the user to rate each different LP, selected on the previous screen. (in a carousel) 

Does Proto.io support these things and if so, where do I start?

Thanks in advance!


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