ITEMS group 1 group 2

10ml $3.00 $2.92 20ml $4.25 $4.14 35ml $6.50 $6.33 40ml $10.00 $9.75

for proper format please see http://snag.gy/qBL5Q.jpg

I have configurable products in different bottle size, I want to set price for different customer group as per attached screenshot.

quick help please