How to link the variable entry with the planning function execution

Hi All,

I am new to IP , we have a requirement where the user enters the value 2008 for a variable year. Then we are supposed to copy the same combinations for the next four years against which the user will be able to input the key figure values. But i have only 2008 data in the cube, so i need to generate new records for the same characteristic combinations as present for 2008 for the next four years. I am planning to use a copy function for this but how can i trigger this planning function once the user enters the value for the year variable. I want the planning function to get executed once the user clicks OK after the variable entry. Request your valuable inputs on the same.