after so many time (Half year ) i have make something like a simple single player level ( thanks to polamee's single player tutorial and polar bear's singleplayer tutorial) i have finally make a single player level ,simple one nothing more that ai place and weapon spawn with h3 weapons,brutes floods,and enforcer with shields ( note: i put a orange elite as a sniper with a Beam rifle reeplazing the jackals (wich don`t appear on the map for some history reason)well i can say that defeat that sniper elites on normal its really hard unless you have your tactic against them well i want a script that make the map to open the next single player level like say if i call my map c30 that trigger another map that follows the history that may be call c50 so...
how do i do that?

Jesus dude. ENGLISH. POST. IN. COMPLETE. SENTENCES.

Anyways, it's (map_name MAPNAME).

right...sorry well i know that of map_nam... but what i need its a script to do that the singleplayer level when he reach that trigger volume the map start a cutscene and after close itself how do i do that?

If you want to launch another map, you would use the command map_name nextmap after your cutscene. If you actually want to return to the menu, I do not think that is possible with scripting.