Getting a plan key for the specified branch

[Rodion Alukhanov]

Bamboo automatically creates keys for branches of the build plan. For example, if my project key is "FOO" and the plan key is "A", the first branch will get the plan identifier FOO-A0. The second branch will get identifier FOO-A1 etc.

I am using Bamboo Spec and I want to create a new deployment project for a predefined branch. For example I have a branch "develop".

How can I find the key of the branch related plan. Related to the example above, is it "A0" or "A1"? Is there a way to find it out?