How to optimize a complex function using ga?

My function is dependent on many discretized functions which are constrained wrt each other. Can it be solved using ga function syntax as provided in documentation? If not ga, then how?

[Star Strider]

If your function produces a scalar ‘fitness’ value for your function with respect to all the parameters you want to optimise, then ga can use it.

[Nayan Rawat]

Thanks, i will try to solve. Can other algorithms also solve it? (SA, pso, patternsearch etc)