How to define a softbody object that is partly flexible?

[Daqud]

Hi,there

I just wanna define a object that is partly deformable such as cable.

What I tried is that I created blueprint from cut-out mesh and attached it to original mesh.
However the part of original mesh out of cut-out mesh doesn't have a Collider and allowed other object to pass through.

What to do for creating partly deformable object?
(This kind of case exists: rigid part -soft part - rigid part)

And I wanna do that by Script.
I need to do this as soon as possible...

thanks in advanced