Bamboo Group Deploy Projects
There is an improvement issue open for, I think, exactly what you're looking for: Bamboo should be able to group projects:


  Description
  
  I'm mulling over redoing our project heirarchy and grouping things a
  little more logically, and realize that being able to group projects
  in Bamboo would be brilliant. It's already stellar that each project
  can contain multiple build plans. Having project groups (a la Jira)
  would make my OCD squeal. Any chance of this?