How to pass values back to vCAC from a vCO workflow?

I'm working on a custom naming convention setup in vCAC 6.1 and I've got the custom properties going in to vCO via the BuildingMachine stub using the vCAC plug-in extensibility workflows. I can create my custom name in vCO, but I don't know how to pass it back in to vCAC. I've seen some examples using the vCAC designer, but I'd rather just stick to vCO at if all possible. I feel like this is probably pretty simple, I just have not figured it out yet.

Any tips?

Thanks,

Jake