tangryuno
Hi
If you wan to use different layout for the different Menu items, you have to make a copy of template style : http://prntscr.com/rgx9sg
so you can choose different layout in each template style and assign a different menu.
Sublayout work for child pages, for example Home Menu used home layout and u want when you click on its articles that article page will use a different sublayout.
There is the possibility to edit by T4 the module title font dimension or only from css override code?
There is a list of module/components with a demo that should be use in the website?
Please give some screenshot and URL how u want it as you can add own style classes and suffix in module to add additional styles.