JoomBri - add locations into JoomBri module

I need to modify JoomBri module for Joomla 2.5 This module works like freelancer.com, but its use will be different (will be used to search for manual workers in CZ). For this cause, this module will only work with categories, but for me it is important to create a 'higher category' that will determine the location of work. Search projects must also support filtering by location and category. When entering a new project will have to choose one of the contracting categories.