I have added a particle emitter then I use a CopyStamp to attatch some instances of a grid.

My question is I want that instances have cloth behavior, so I add vellum cloth to grid, or after CopyStamp in SOP context, but instanced grids from particle emitter don't acquired cloth properties.

How I can to do this setup?

Thanks

Do you want something like this?
As a side note do not use copy stamp, it is being deprecated since Houdini 16…