Combine More-Tag with Category-Protection

I would like to protect all content beyond the more-tag for all post of the category "Premium". The content before the more-tag should be visible for everyone. Is it possible?

I'm trying to set up a site where everything is public up to posts of the category "Premium". These posts should be public up to the more-tag. The content beyond the more-tag is only visible to Members of the Level "Premium".

Regards
Henning