convert class-methods parameters to function module parameter?

HI all, I need to convert class-methods parameters to FM parameters. I have zclass with zmethod. which has 3 importing parameters and 2 changing parameters.  Now i need to replace this method with FM  along with parameters . So i used 3 importing parameters in FM import parameters. Now where do i need to put method's 2 changing parameters in FM? Do i need to put in Changing parameter or tables parameters.? Thanks