How can I automatically split orders to two different print-on-demand vendors?

I’m just getting my POD store set up and I have apps installed for Printify and Teelaunch. I noticed that when an order containing items for both Printify and Teelaunch was placed, all items were sent to both vendors for fulfillment causing errors. Is there a way to ensure that each item in an order will automatically be sent to the correct vendor?

Hello, I am having the same issue and was curious if you ever solved the problem?