Fragments of the molecule can be rendered as a “ball and stick” molecule:
(make-ball-and-stick imol atom-selection bond-thickness sphere-size draw-spheres-flag)
e.g.
(make-ball-and-stick 0 "/1/A/10-20" 0.3 0.4 1)
The ball-and-stick representation can be cleared using:
(clear-ball-and-stick imol)