How to enlarge parts of an object, not the entire object in grasshopper?

I am new here and I don’t know how to beast explain this, I want to upload object to unreal Engen 5 but I want to change the scale of the specific parts of the mesh at any giving time with out changing all the parts scale. I don’t know is the grasshopper can do this thing or I am out of my way.

If you know the answer or know someone might can help you can point out thankyou

You tried using Rhino & CageEdit? Or just select the mesh faces and scale them in Rhino. Can’t see any need for grasshopper.

Try MeshCageMorph 1 or 2
They are plugins.