box b 10 10 10

box c 4 4 4 
ttranslate c 3 3 6

bfuse rr b c

restore A1_rr_7.brep A1_rr_7
prism p1 A1_rr_7 0 0 -4

explode  rr so

bop rr_1 p1
bopcut result


set square 664