Main template and subtemplates depending on menu item.

[eluser]Vanitas[/eluser]
Hi, I just discovered CI and the biggest trouble for me is to manage with templates.
I'm not a web developer so just don't know how should I solve some things.
My problem with templates is that I can't create one main template and then depending on item in menu load content sub-templates into main template.
What libraries are you using? I've found Most Simple Template Library and trying to manage with that.