Say I want to be able to ask an NPC two questions infinitely until I say goodbye, currently I have it so when you start asking questions, you're given A, B, and G (oodbye). Right now I have it set it so A branches to A, B, G, and B branches to A, B, G. Is there a cleaner way to have this effect? If I wanted to ask 10 questions that's a lot of extra branching paths.

A better way to do this is to give one (or a few to mix it up) 'loopback' topics. Instead of having A B C G, have A B C D G. Wherein:

A B C link to D and are marked as 'invisible continues', and D links to A B C G. That way if you pick A, the NPC responds, then says D, something like "Anything else?" then the player sees all choices again. That way you only have to link D to all of them, instead of linking all of them to all of them.

A tip, have a few D options. The NPC saying the EXACT same line as a loopback gets a bit stale, do 2 or 3. Less work than fully linking 10 branches together, and better result than one single loopback.

All right that makes sense. Thanks.