Am I right to think that an object that's part of a solid subtraction or addition ought to have an absolute position, relative to the drawing origin?   In other words, say I draw solid (A) and solid (B). I subtract solid (B) from solid (A), to create a new solid, (A-B).   The void in solid (A-B) is obviously in the same position as where solid B was, before I performed the subtraction.   Now I edit solid (A-B) - I go into it and move the location of solid (B), and t