Not exactly that you want but ...some rustic & efficient! ;)
You can launch any number of sessions of moi!
And make some Ctl +C / Ctrl + V if needing for copy past something between them!

Nice trick Pilou !
Never think about it, but it's a good trick.
My solution for my models is to copy/paste in the same file, but it could be limited...

That also works. Save Incremental command helps in that case.

Thanks Pilou,

Hi Stargazer, I have some ideas for future work similar to that but it will take a lot of effort.

For now, yes IncrementalSave is probably the closest type of thing.

- Michael