Merge branch B commits to branch A

[harsh]

I want commits made to branch B to automatically merge into branch A. In settings -> Branching Model I have set the following:

1. Development branch name: A

2. Production: No production branch

3. Branch prefix: Release (prefix B/)

4. Automatic merging: On

I create branch B/1 and push changes to it. My expectation is that this will create a PR to branch A. I do not see this. What should I change in my settings to enable this behavior?