How to handle execution of different actions in loadrunner

Hi

I have 5 different functionalities I need to club them in one script. 

And I need to handle the execution seperately if required by passing functionality name so that the exact functionality will execute.

Ex: Functionality A,B,C

If I want to execute only A,C  every time I don't want to change the runtime setting and disable the un wanted functionality.

Is there any way so that I can tell the script to execute only those two actions in my script by passing any parameters or variables.

Is there any possibility in loadrunner?

Thanks

Himabindu