it is posible to create page which see only from private group and add link to modul "multiMenu"

Yes it is. You can create custom html pages using (say) the TinyD module. Then create a new custom group (system -> groups) and set your permissions to only allow that group to access/view it.

You can build custom menus with Multimenu, but you might not need to - if you just want the link to appear in the main menu, groups that can't access module won't be able to see it anyway.

Some modules also have category-level permission systems built in (eg. WF-downloads) so you can create private sections of some modules as well.

[Please don't double (or triple!) post your questions in the forums - once is enough].