Point cache animation resaving


Hi Guys,

I have a simple pointcache animated object and I want to delete part of the object.
I put an edit poly modifier and delete all is fine animation is still running fine as the modifier is over the point cache one.
Now I can export that via alembic.BUT what if I want reexport that via fbx or rewrite a new pointcache…It doesn’t seam to work …( via the record buttoon) …how do I do that and how do bake it ?