Have a main balloon along with sub-balloons
Have a main balloon along with Sub-Balloons so instead of only having the option for 1.1, 1.2, 1.3, etc. users can select to have a "Main" balloon of "1" and sub-balloons of "1.1, 1.2, 1.3, etc". Also, the ability to have 1.2.1, 1.2.2, etc.