Flat Shipping Per Product
I've been looking at this for a couple of hours, have come across a lot of similar topics, but nothing specifically matching, and that leaves me stuck on one point. Here's what I'm trying to accomplish. There's the base flat shipping price, and then each product has a "flat shipping" field where I can enter an additional shipping price for that item. I can't just roll shipping prices into product prices because local pickup is configured using the free shipping service and has to remain available.
I've tried setting up a rule to add that value to the shipping cost, but simply can't get any conditions or actions to access that field. I've tried entity has field on commerce-order:commerce-line-items:0 / field_flat_shipping, which I've seen suggested in a few places, but this doesn't add any new data selectors to my actions. In fact, I'm not entirely sure which action to use - right now I'm just experimenting with add a rate to a shipping service for an order, but I don't know if that's correct.
Anyone have any suggestions?