Global Product Search (Searching Criteria)

Hello,

I hope you are having a great day.

I have a problem with the search function as it allow the visitor to choice only between Categories or tags in their search criteria, but i must allow them to use both as im using tags for cities.

and i need to allow the visitor to choice the city and the category and finally the price range and the website should fetch him products form across the network that fits his criteria,

as of now it works perfectly except for the (filter by) it asks to choice between categories or tags and i need to allow him to use both.

Thanks & Warm Regards

Mohammed Almajed