The number of Babes you can assign depends entirely on the building's level:

  • Level 1 Building: Can assign up to 3 Babes
  • Level 2 Building: Can assign up to 6 Babes
  • Level 3 Building: Can assign up to 9 Babes
                               
Mechanical Factory is an exceptional case that can only assign up to 6 Babes. 

To manage your team, head over to Collection Mode and look for the [Garrison Management] button in the top-left corner. Tap it to view all available buildings awaiting a garrison. From there, you can choose to either auto-deploy or manually select your designated Babes.