Look at the post from philch on this
I went through the whole thing acouple of months back with American Filament, they provide filament profiles/presets also. Took me a while and I actually ended up with dupes because I did the copy procedure and then did the custom preset add.
I am LAN Only, always have been but my profiles are all under.
C:\Users\nopeeking\AppData\Roaming\BambuStudio\user\mynumbernotyours
and nothing under …\user\default
There’s also this post I came across, and others I can’t find at the moment.
https://www.reddit.com/r/BambuLab/comments/16j5189/filament_profiles_importing_both_filament_and/?rdt=46477