Welded Curve between polysurfaces

Working in Rhino 8, is there a tool that will let me move a mass and update or stretch a line that remains welded to a point? For example, I am creating polysurface powerlines and would like the wires (as curves) to remain fixed to the same point on the post, but stretch between two and stay attached at the ends. Whenever i move the posts, I would like the endpoints to remain fixed to the same place on post and stretch or shrink. Alternatively, there may be a way to make a rail between grouped points, but with 100+ posts, this seems like an absolute hassle.

Hi Braden -

It sounds like you can just select both the “mass” object and the sub-object point(s) of the line and then move those together.
-wim

I am working with a series of about 100 posts. With four wires attached to the posts, with wires going backward and forward, that quicky spirals into selecting at minimum 800 curve points, too much. I want the curves to update without selecting them, if possible. Essentially welded.