I will add the file soon. the reason why I need this is because i may have 70 houses, but made up of 8 types. it would make sense for me to Xref each house several times. this works fine until I try to 'flip' or 'hand' the house to the opposite side, this then makes all the objects go funny, flip and not display correctly. my only current choice, and it is what I am actually doing is unfortunately collapsing to mesh, which of course then increases memory requirements and file handling reduces.