I still cant get TC to read symbols created using sd2
So I experimented
It seems that a Static symbol will work but not a block.
They do attach to the walls but they don't cut the wall so you need to use some sort of a mask
w1=900 //static symbol width
S = StaticSymbol("Door1.tcw");
mask=SetProperties(Rectangle(w1,W+5),"brushStyle"= "Solid","PenColor" = 0xffffff,
pr = RefPoint(0,0,0);