Currently it's possible to set up a dependency chain in a way that when a building a plan finishes, it can trigger other builds (as a child build).

What I would like to do is to have parent builds, which is the same thing, but the other way around:

• I set up build A as a dependency of build B.
• I trigger build B.
• Instead of build B starting, it will trigger build A and when it finishes successfully, build B will start.

Here's a relevant discussion from the forums.