Add Inventory to a Location

[HunkyBill]

I have an interesting oddity I am looking for an answer to.

Take a Shop with two locations (A and B). All the inventory is currently available at A. We also want it to show up at b. It is not possible to do this with the Admin, except by using Bulk Editing and adding items to B that way. That sucks. (I am open to suggestions here for an easy way??)

So with API calls, when I try and set a quantity of some Inventory Item to X at Location B, it gets rejected and says no inventory for that item at Location B.

So what is the "I am a dummy, do this" way to ensure ALL InventoryItems are found at a location so that I can set their levels, without doing too much work. What is the secret sauce to that?

Thanks