How To Enhance a Standarad Method

Hi Experts,

I have a requirement where i need to enhance the standard method. The reason for this is:

In one of the portal, user will click on one number rellated to that number a standard adobe form will trigger.

For this standard adobe form the back end functionlaity is written in in one of the standard method of a stnadarad class.

Now i have copied that standard adobe form to my z adobe form and i have included some extra fields in that form.

Now what i want is i need to display my custom adobe form when we click on that number in portal.

For this purpose i need to enhance the standard method where the standard back end functionality is written and i need to populate the data for extra fields which i have included in adobe form.

Please suggest me how to enhance this standard method to include my custom code.

Venkat