Getting a 'three-way' option in a mission?

[p7p8]

With my method you can set own % for each mission. For exapmle:

15% for A - then create (1)
25% for B - then create (2)
60% for C - then create (1a)+(3a) or (2b)+(3b)

(now is 10% for each mission but one variant must be created - which is highest priority for dynamic group)