[TYPO3-templavoila] Site template with many Page templates

[koen_gate74]

We are afraid it's a silly question, but we are stuck on it the last 
days. We know workarounds, but something tells us there must be a 
better, cleaner way.

Our problem is, that we'ld like to create a site template with an header 
(with logo and menu level 1), a footer and an area where we can include 
the different page (sub)templates.

This could be for example a subtemplate with 3 columns, where the left 
one is a menu level 2, the middle a free content area (flexible content) 
and the right for news and promotions. Or another subtemplate with 2 
columns or one with 1 area etc. (See attchment for visualisation of the 
problem)

It would be even more perfect if the 'end user' doesn't see the site 
template, but only chooses between the page (sub)templates.
(Has this something to do with the default template?)

The way we interprete TV from the tutorials, is that you reapat the 
header and footer part on each site template. But if there are 10 page 
templates and you have to change the header, you have to do this on the 
10 page templates, and with the system of the site tempalte with 
different subtemplates, you only have to do this on one place.

We suspect that we see it probably not the right way, but maybe a little 
hint can point us to the right direction on the global view of TV on this.

Thanks in advance!

Koen & Kris