I’m sure this has been discovered by many before me but I hadn’t known about this until recently and I figure this could help someone in my position. I was having some difficulty finding a way to reset my SRS for a document that I used last semester, and after some experimentation, I found that one way to do it is to highlight EVERY rem in the document, copy it, go to the settings, click on import, and paste the rems in the paste section. For me, I found that it keeps most of my edits intact compared to direct copy/paste and markdown importing. One thing I did notice was that portals were forgotten and replaced as an extra unused rem.
Edit: It looks like that tags aren’t imported using this method .