I have knitted 4 surface planes to define trimming plane and had hoped to spilt 2 different configurations using the same knitted surface.   Original split works just fine in one or the the other configurations.  If I leave Split1 unsuppressed in configuration 1, switch to configuration 2, suppress Split1  and try to define new Split2 with new body filenames I am unable to select knit surface, and selecting the 4 original surfaces it says unable to split with selected features...   Looking to achieve Config 1 with Part1/Part2, Config2 with Part3/Part4.  Seems like it would be straightforward..