Can I Create a separate “Category” menu?

Hi People

I’m wondering if it’s possible to create a 2nd navigation menu (actually set it up in “menus” already) out of CATEGORIES, and have it display separately from the normal “pages” menu?

My theme (“Tuneup”) seems to only allow one menu placement, right now it’s below the site logo banner. I’d like to move my main nav menu to the top of the site banner, and have the categories menu below the logo banner.

Be great if there’s a plugin that could manage this, but I’ll likely have to hack functions.php and header.php.

Any advice or help would be greatly appreciated!

thanks!