Jose Capco wrote:
Well the problem is the following... I want to use
\newtheorem{theorem}{Theorem}[section] (or chapter..)
and when I go to the body of the document I want to somehow be able to get "Theorem" in the pulldown menu where "Standard" and other definitions are placed.
Then you have to create your own layout file. They are explained in detail in section 5 of the Customization.lyx.
regards Uwe