I’m not sure, I’m using documents produced by a larger org. The message I get if i try to edit the locked parts is:

The author has locked parts of this document. You can make changes only to the unlocked parts.

Btw i tried using Google docs on these Word files and the formatting broke in all kinds of terrible ways.

I know the idea here is to maintain consistent branding among the franchises. Anything sent back to the parent org needs to be in docx format, with no changes to the locked elements. If that can be done with a FOSS program, great! Local use has more leeway, but broken formatting is a nonstarter

One of the organizations I work with uses Word docs with locked fields. How does only office do with that style of chestnut?