How to start remastering in nx
What do you mean by remastering?
getting duplicate copy of design , in simple word malpractice.
You can open ie. CATIA files directly to NX, including assemblies as well. But they are always dummy parts without any features. To convert a CATIA file to NX with features/parametric you need extra tools for content migration, which are quite expensive ones. So it's possible but comes with a price.
I'm not totally sure if that's what you meant but I understood that you want to open CATIA file in NX with features and it being therefore parametric.
Converting model from nonparametric to parametric... Ex..converting CATIA model to. UG