Change WordPress user roles and capabilities › Forums › How to or FAQ › Assign Different Pages to Different custom post type option › Reply To: Assign Different Pages to Different custom post type option
It depends from how custom post type (CPT) is defined. WordPress core register_post_type() has ‘show_ui’ parameter. If CTP is defined with show_ui==FALSE then you will not see it, even is you administrator.
If CPT is viewable by user with enough permissions, then it’s possible to manage who can view them. Look at this article.
Take into account that, some plugins use internal data structure for their records instead of WP custom post types.