hows about
Select the circle and line and move to new location (if you want
reference to the orginal location, copy them and then move the
copies).
Select the end node of the line with the shape tool (F10) and
extend/contract the line back to the original location.
Draw and place your circles, then use the Interactive Connector Tool found
first-to-last in the Freehand Tool flyout (fourth button down in the
Toolbox Toolbar; the pencil drawing the wavy line).
Select the Interactive Connector Tool then look to the Property Bar. There
are two selectors: Angled and Straight connector.
Sounds like you want the Straight connector.
Use the Connector Tool to connect point A with point B . . . when you move
the Object that holds point B, the connector line will move to follow, but
point A will remain stationary.
As Craig said, make sure you have Snap To enabled so you can connect precisely.
--
ah