Add columns in admin pannel

Hi Dear,

I it possible to add in admin panel>my affiliates\partners 2 columns that shows how many visitors and how many purchases each affiliate\partner has? so I could see all information for all my affiliates\partners in one pages.

I you cannot do it as an upgrade, could you give me the code to put in php file and in what php file?

Thasnk again for your great plugin,
Yosi