I cant figure out if its possible to Build other project (manual step) after multiple other builds have been triggered (Trigger parametrised build on other project with multiple builds). The manual step should not be visible if one of the other builds fails or is not finished. The button should only be visible if all the other builds have been successful. This is possible to do when the build is not manual. Then you do it with join trigger => Run post-build actions at join => Trigger parametrised build on other projects.