Wilson Large's Lounge Discussions

Greetings fellow writers. I have a feature screenplay that I enlisted some help on for a few drafts of the screenplay. Since then, the contributor has chosen not to be a part of the project and will not sign a contract for the work they did. So now I need to go back through the drafts they submitted, track and delete their contributions across all future drafts. We wrote in Final Draft.

Is anyone aware of features that would make this task easier for me to get done? ANy ideas using other softwares are welcome as well.

Thanks!