custom screen for vendor master xk01

Hi Experts,

   Any one suggest how to add custom screen with custom fields to transaction XK01. Also i want to display this screen by clicking on some custom button. so that user can enter the custom values and should capable to store this information on custom table.

XK01->vendor details with check box General choosed->Press enter->click on the custom button-> custom screen will display ->provide the values->save this details to custom table.

Thanks in advance.