Add a movieclip on button press, remove on another button press

Sounds a little confusing maybe, but the idea is rather simple… I’m trying to figure out a way to have a + and a - button. When a user hits the + button, a movieclip appears. If they hit it again, another duplicate movieclip appears next to the first, etc… basically adding movieclips along the x-plane. Now, when the user hits the - button, the movieclip on the furthest right-hand side is removed, when hit again the next movieclip furthest on the right-hand side is removed, etc until there are no more movieclips.

It’s basically an add and subtract movieclip function but I have no idea how to set this up. Any tips or advice would be greatly appreciated! thanks in advance!