multi radius colisions

how do you make a child entity with a colisionsphere effect the parent, ie changes the position of the parent. I have tried it and the child obeys the collision but the parent does not change until it hits itself.
Imagine a man with a BODY and two FEET. the body just continues to move down until the feet touch his arse. My actual problem is a little more complicated but this is the basic of it. Alternatively is it possible for one mesh to have multiple colission spheres and is there a way of changing its position in the mesh, or is it locked to the axis?

You'd have to code a system to control this to get it like what you seem to want. It's not built into Blitz.

use the distance from the shild to the parent. and do your own collision routine.

this will let you do what you want.

if distance(parent,child)=< parent\radius+child\radius
we have hit each other,
lets move the parent with a global flag, and then move the child.
end if