Importing with Impex

[Antiblank]

So I was using a phpbb boards for a couple of years and now I've set up and modified a vBulletin board finally. I've done all my mods, style, etc work on the new vB boards.

I've been using data that I imported with Impex previously to do my testing. What I need to know is it possible to empty out all the users, their posts etc. Reimport without messing anything up. I've just put alot of time into building this new board so I don't want anything to mess it up. But given that my users have still been using the phpbb boards over the last 2 months while I've been working I certainly can't use just the data I imported 2 months ago.

Thanks for the help, I hope I was clear enough.