In reality, a castle is long code which looks like it:
{"l":["tg","mg","bg","wc","id"],"r":["rw","rwc","rs","rsc","ri","ric","rb","rbc","rfb","rpb","rrb","rf","rl","rr","ra","rp","rc","rsl"],"c":["fsv,500,380,1,1,0,1"],"n":"","t":[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],"o":-1,"":""}
Go in "Load" and click on "Import". Copy this code.
Explanation: The part where["fsv,500,380,1,1,0,1"] is wroten is the foundation block code. To do move the block, wrote 90 instead of the last 1.
You can do it with any beams but that's different:
{"l":["tg","mg","bg","wc","id"],"r":["rw","rwc","rs","rsc","ri","ric","rb","rbc","rfb","rpb","rrb","rf","rl","rr","ra","rp","rc","rsl"],"c":["bic,475,375,0.5,3,90"],"n":"","t":[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],"o":-1,"":""}
When that's a beam, you can change his height ":["bic,475,375,0.5,3,90"]
0.5 and 3 are the two heights.