Clavo

Hi all! This is the first time I am seeking some guidance. I wanted to know what command line I would need to run a specific game from my Odyssey 2 romset using Mame/front in is Launchbox/Bigbox. I can get the games to load in Mame after selecting Odyssey 2, then select the specific game from the list within Mame. My challenge is to get launchbox to load the games directly? If I point launchbox to the Odyssey2.zip, I get a gray screen and no game selections. I was wondering if there is a command line to get specific game to load from within the romset without using Mame. I want to load game individually from Launchbox, Any advise will help!