Differentiate location when combined shipping in Flow app

[Anonymous]

My shopify store has 2 locations (a shop and a warehouse) orders can come from both locations and are classed as combined - I use tagging to tag each order with the location that they come from and therefore my combined orders have both 'shop' and 'warehouse' as tags. 

I currently have a Workflow set up in Flow that adds a line into a Google Sheet that is triggered if an order comes from the shop

This is working well, but when an order comes from the shop AND the warehouse (a combined order) I would like to differentiate what products have come from the shop Vs the warehouse - I need to know the variable which would define the fulfillment location. 

Any help would be hugely appreciated.