Add/Remove a chunk of stuff to the bottom of the screen?

Hello all, I am a college student new to this website. I need to make an app for a class using Proto.io and had what I think may be a simple question. I am making an app that calculates the cost of a food bill and splits the tab. I am wondering how I can basically add and remove a chunk between the bottom entry and the Add/Remove/Next/Back buttons at the bottom. Each addition will have a text field for item and cost as well as 4 buttons (these are the people involved). How can I do this? It also has to retroactively delete current entries.

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