I'm Willing to pay people to make creation master for fifa 21
I was looking for it recently, for the compdata files....
As far as I understand you just need to modify the compdata files in FIFA Editor tool Legacy explorer to make the modification work, you don't need to do a "Regenerate BH files" like in old FIFAs,
So, I decided to try something, and I was able to open the FIFA 17 compdata in CM 16 Editor, unfortunately FIFA 21 was refused by an error.
What I did was just extract the legacy files from FIFA 17 (compdata txt files) using Frosty Editor, and replace them inside my FIFA 16 installation.
In CM 16 the problems started, various teams inside the Tournaments tree were "Undefined", it happens because the list of teams are obviously different in both FIFAs (fifa_ng_db is from FIFA 16, if I try with the FIFA 17 file it crashing on opening), and the worst thing is, saving the modifications cause a fatal error. So you can't change anything in the end.
I decided to search for the source code of CM 16, so maybe I could adapt the code to at least save the modifications in the compdata files, I only found source code from CM 15, which can be useful....
https://bitbucket.org/fifa-tools/cm15/
I'll have to look into it to know which version should be easier to adapt for, 17 or 21... I honestly prefer 17 because the gameplay is better.
Now I'm thinking if worths to dive deep into it... my experience is in Java programming, but C# is very similar, I'll lose my life if I decide to do this thing.