I hope this is not a dumb question but I seem not to "get" or “find” something.

What I'm looking for:

A solution where [custom] pages [html] will show wrapped in the center but the blocks left and right stay. You come to the site, either "annonymous" or as "registered user" or whatever group and you have a nested menu and the content shown in the center with block left and right. You click on the menu e.g. company info and the center page changes. The blocks left and right remain.
In admin you will see the pages so you can setup/select what to show to whom (group)

I tried tinycontent, icontent, mypage, etc but non seem to do what I look for.

Anyone know something or have an idea to help?