Help me to modify a Wordpress / Google Maps plugin.

Hello, Here are background details ... I'm using the following Wordpress theme. It allows a customer to search for vendors that are in specific areas of a Google map -- > [login to view URL] ... I'm also using this plugin -- > [login to view URL] The theme also allows the administrator to organize vendors by "category", as explained here -- > [login to view URL] ... And the plugin allows the administrator to determine the area(s) on the Google map *where* a vendor will deliver products to its customers, as explained here -- > [login to view URL] --- Here is an explanation of the project ... Add the following additional functionality: 1. Update the theme's "category" logic so that unique map delivery data can be saved for each vendor, and each category that has been associated with that vendor. 2. Update the theme's "category" logic so that all category buttons will appear on-screen simultaneously, and will act as filters that can be activated and deactivated at will ... Which will directly affect the data displayed on the Google map. ***The current logic of the theme only allows one category to be active at a time. 3. Update the logic of the theme to give clients the option to search for vendors that are providing services in two areas, simultaneously. Let's talk.