I am modeling a design in state flow, when i am writing the condition for state transition it is showing complete 10 input expression. design looks clumsy, how to avoid that.

I am modeling a design in state flow, when i am writing the condition for state transition it is showing complete 18 input expression. In my design I have 18 inputs every time when a state needs to be changed it has to check all the 18 inputs combinations if write simply that expression design looks clumsy, how to avoid that. is there any way to call a function for state transfer condition.