This will be shader work I expect, at least the visuals. You might find a dissolve shader tutorial useful, just without the glow. You can do this with the built in Shader Graph no code required.
See what this guy does at 14:16 in this video. I think that’s what you’re looking for but one dissolver slider in each dimension instead of just on the Y:
If the collider needs to vary too, I assume this works, but never used it:
Other types of colliders have their own equivalents, for example:
Hi Thanks for the reply but what I’m looking for is a cross section slider, I want to be able to section a mesh and use a slider to slide the section plan.
Just a friendly suggestion then; you should try to ellaborate more when you ask a question otherwise it can be a complete guessing game when ambiguous questions are asked.