Keeping inventory and shipping separate for multiple warehouses

[qott]

Hello Shopify Community!

We currently have 2 separate online shops, linked to 2 separate warehouses - one for the US and one for CA. Our US shop/warehouse uses Shipping Easy for their shipping needs and the CA shop/warehouse uses ShipStation.

We are thinking about upgrading to Shopify Plus, which means our 2 stores will be combined into 1 and will use the same backend, however we'll still have separate warehouses so the shipping and inventory tracking needs to remain separate.

A possible solution for keeping shipping separate, is filtering our orders based on shipping location within our separate shipping apps (Shipping Easy & ShipStation). However I haven't been able to find a solution for making sure the inventory is pulled from the correct warehouses. With the "Locations" function I understand that it's not based on the customers' proximity to the warehouses but rather the stock levels.

Looking for a solution to keep the US and CA shipping AND inventory separate on 1 store. Any help is greatly appreciated!

Thank you so much!