How to setup Bamboo Build plan to build branch only if a pull request is created?

[Esztergályos Bence]

I would like to setup a trigger for a Bamboo Build plan, I want a build to run only if a PR is created from that branch. Is that possible?

Given a Bitbucket Feature branch, when I create a pull request and the feature branch is the source,  I want Bamboo to create a Plan Branch and run the branch.