Batch file tree structure

I'll bet there's plenty of people around who know their way round batch files, they really ain't my thing, I've written the below to convert all .md files to .docx, it works, but I want the output files in another location with the same file structure (there is a file tree in Documentation) - assume I already have the same file structure here: "U:\Documentation", I suspect that there's a way of removing parts of the file path, specifically anything before "Documentation", but I can't suss it out.

Any ideas?

I've attached the code, since if I try and post it, the forum has a hissy fit