I'm kinda new to this, and I kind of had to give up my story because of the amount of chapters that were piling up as I continued writing. I wanted to start by making a story with several choices (mostly sexual) but following the same path. But in the midst of it all I got complicated, because I had to add many chapters equal to each choice I made in the story https://chyoa.com/story/A-Femboy-in-the-Wall.23843 Click in "View story map", it's a mess. Is there any way to make two choices, but no matter which, they end up in the same chapter without having to post two of that chapter? Just like in Twine, when you put two passages that lead to the same destination. Sorry for the bad english, it's not my native language.
Yes, you can have a "link chapter" which sends the reader to an already-existing chapter instead of a new one. You can read about how to that here.
Zeebop beat me to it as I was typing. Basically you write chapters 1A and 1B then write chapter 2A and 2B after 1A then you can add linked chapters after 1B to chapters 2A and 2B. Hope that isn't to confusing.
If the decisions should make difference after linking back into the main branch, you could additionally use Game Mode variables to track recent events. (Conditional Branches)