Thanks for your question. The first thing you'll want to do is save your FAB 3000 workspace (*.wrk) -- so you can make sure all your edits have been saved. Go to menu: File / Save Workspace, and select the location where you'd like to save your workspace.
Now lets export to a Manufacturing format:
1. Probably the easiest thing to do is export as an ODB++ (because the ODB++ contains everything in one simple file). Simply go to the FAB 3000 menu: File / Export / ODB++, and select the location where you'd like your ODB++ file saved.
Note: If you're unfamiliar with the ODB++ format, I'd recommend that you just use the default options.
IMPORTANT: If your manufacturer does not accept ODB++, than use "Export PCB" (see below).
2. EXPORT PCB: The nice thing about "Export PCB" is that it exports all required files for manufacturing (Gerber, Drills, Reports, etc.) in one command.
Go to menu: File / Export / Export PCB..., and select the folder where you'd like to save your gerber, drill, & report files. Use the default options.
Note: I'd recommend that you choose a new folder to export to. This way you avoid any potential conflict/confusion with your old gerber/drill files.