Below is the vertical gallery image:
How it looks like after "Office" item in the vertical gallery is selected:
When on select office gallery item, I only want to show area description for storey 1, builingID 1 and area description to be Office.
You can achieve that by creating a collection in the OnSelect property of the arrow icon on the first gallery. This can be achieved by using the following formula.
ClearCollect(
TempCollection,
Filter(
Datasource,
areaName = ThisItem.areaName
) )
You can then set TempCollection as the Items property for the second gallery