I would be very grateful for expert guidance on how to do this manually.
I had hoped for a recipe. I understand the solution is not obvious. I prefer not to start a remote screen sharing session now.
My plan was to copy the O365 normal.dotm to another location and replace it with my O2010 normal.dotm. Then I can do the auto-correct and the other stuff while working normally, adjusting features accordingly.
If you say the transfer of normal.dotm from O2010 to O365 is feasible, I can do the rest myself.
I appreciate your admission of Microsoft's shortcoming. I have used Word for more than 20 years, and have had to endure several transfers of templates, macros and other features,