Need Help Adding Alternate Lines to a Lichess Study

I recently started reading the book 64 Great Chess games.

I decided to create a Lichess study containing the moves to all 64 games so I can follow along without losing my place.

The Problem

This book contains several alternate lines in each game, some of them dozens of moves deep. It's too difficult to follow (I'm still a beginner) so I figured I would program all the alternate lines into the lichess study.

I have taken other studies where alternate lines appear as small text inbetween moves that I can click through. Unfortunately, it's very unclear how to do that.

I tried clicking the "Force Variation" button but it just turned the entire game into small text, and there was no way to undo it.

Does anyone have any tips or recommended tutorials for how I can go through the game and add alternate lines? I couldn't find any clear explanations on the lichess help page or youtube.

Thanks!