Share 'HOW DO YOU MANAGE YOU ISSUES AND REVISIONS?'

HI, I was wondering how everyone manages their submittals and revisions. Do you create a new file every time you re-issue a drawing or do you manage it in a single file? Do you carry an entire project (with design development issues with the client to city submittals to construction documents) in a single file? Is there a way to freeze a layout book so that it is always at the state it was when…