Mapping Venues based on Function Room Slice

[Segolene_Sansom]

Hi,

I have 2 levels of data: Venues and Function Rooms.
I have a slice currently on Function rooms based on user data input (postcode of venue, function room capacity).
I would like to map the related venues that appear in the slice (with their detailed info) however at the moment if i do this i will get multiple pins at the same spot as there can be many function rooms in one venue as i map the function room slice.
What would be the best slice/formula/other thing to use for this?

Thanks in advance!