I've been using LP for awhile and I don't think there is a way to do that. Might have to start from scratch and re-setup your screens. I heard that the developer is supposed to be revamping LP sometime soon. Check this page and the forums for more info: LauncherPro ?
There isn't currently a way. He will be releasing a completely revamped version this month. My guess is things like that will be included. Common sense, really.
Bummer, I know. That's cost me an hour so in the past too.