What is the best way to disallow users from changing lines to a record while it’s in certain stages of a workflow? I thought maybe doing a workflow action script, but i can’t utilize the currentRecord module. If i do a client script, then i’m not sure how i would get the script only to execute for those specific workflow states. Any advice?

@Michael Mascitto As @KevinJ of Kansas mentioned, you can set a Return User Error action on a workflow state and I imagine if you set it to Trigger On After Field Edit and set the right conditions, that can get the functionality you're talking about