I have no experience with Shopify Flow, but I want to know if I can create a flow that adds the tag partner to all partners that meet the condition number_of_orders >= 1 AND email_subscription_status = "SUBSCRIBED".
This condition may change in the future, i.e. later on there may be a new condition that will add the ‘partner’ tag to certain customers.
I am assuming you are referring customers as partners. Something like the below image should work. Keep in mind that this example flow only works when an order is created (not fulfilled as well yet).
Breakdown of the flow
When an order is created.
Check if customer that made the order accepted marketing AND customer has more than 1 order placed.