Different Menu on a Different Page

I have a website using the Twenty Eleven theme and I would like to have a different menu on one of my pages instead of the main menu. I have tried a couple of WordPress plugins, but they have not worked as the theme will only allow one menu. I am enquiring if the developers would create the functionality within the theme to be able to have at least one other menu choice, even if it is via a third party plugin.
Thank you for your consideration.