Dear lyx team thank you for all suggestion: i have a group of local layout, and its occupies a larg list. Why? because lyx let me past the local layout in the same place, and after some time i get over than 100 line of code. So, i hope you make local layout mechanism like this:
1- when i want to add my local layout, i past my code in plane text file in notepad or gedit then save it in name like margin ( means local layouts for margin ). and 2nd file for local layouts for theories.... 2- i open document setteng then local layout, then i click on import button(does not exist now). 3- after import my local layout, i see my file name in list window, like modules window, so i can make my files (local layouts files) available or not available. best regards