Your going to have to give a few more details. If you mean you have lots of pages that use templates (i.e. they have something like template=
/layout1/mytemplate.xhtmlat the top of the page) then you can create a custom resourceresolver to return your new template when facelts is trying to resolve the old one. If this is not what you need or you want more info on this technique you are going to have to most more details of exaclty what you are trying to achieve.
Thanks for your reply. I got it correct. I have taken a new Bean called LayoutBean.java and corresponding UI for layout selection. Now I can select either of the layouts on my choice.