Delete Descendants

I just imported my database into Legacy 8 Deluxe from PAF.  Years ago I traded databases with  a very distant cousin and merged hers into mine.  Legacy has flagged many errors in the data she provided.  I would like to delete all the descendants she provided below where our lines meet.  That goes back to the early 1800s.  I'm really only interested in my family line and not very very distant cousins.  Anyone have a suggest on a easy way to delete them?