How to make a choice between layers?

Modding Help
1

How would I make it so you have 2 choices for the next layer, and when you buy an upgrade for one, the other dissapears?

2

update, ive figured out slightly how to do it, using the following lines of code:
first layer (B):

layerShown(){return (hasUpgrade (“jj”,22)) || player.b.unlocked |! player.h.unlocked},

second layer (H):

layerShown(){return (hasUpgrade (“jj”,22)) || player.h.unlocked |! player.b.unlocked},

Unfortunately, it also makes it so the layers are immediately visible from booting up a new save, and I don’t want that. How would I fix this?