Thanks for the recommendation Lew. I have been using the design explorer but with 800 components it is too time consuming to delete them one at a time. I just found the best way to do it is to suppress the parts I want to keep. Then deselect "Suppressed parts/assemblies" from the view menu. Finally, select the first part and scroll to the bottom of the list and select the last part while holding shift. Then press Delete. Then show the suppressed parts again and unsupress them.