Hi there

I am needing to allow my users to view more than one category at a time, however there are too many markers on my map to just give the option to show only one or all categories.
To explain further, we sell retail space in shopping malls and need our client to view other brands (who are their competitors) in the area, so they may need to view only certain brands of restaurant, or only hardware stores etc. each brand is its own category.

Can you help me with this?

regards
Hayley