Custom Field of type Cart Variant

Hi,
I've defined a Custom Field of type Cart Variant. I get a added price, I need to have different prices in different sizes. Is it possible?

Ex.
If the Base price is 20$
Price 1: 40$
Price 2: 70$
....

Now I get as result:
Price1: 60$ (40$+20$)
Price2: 90$ (70$+20$)

Does anyone have any idea? Please help!

Best regards
Joomlis

Hi,
I've defined a Custom Field of type Cart Variant. I get a added price, I need to have different prices in different sizes. Is it possible?

Ex.
If the Base price is 20$
Price 1: 40$
Price 2: 70$
....

Now I get as result:
Price1: 60$ (40$+20$)
Price2: 90$ (70$+20$)

Does anyone have any idea? Please help!

Best regards
Joomlis

would increase for shipping?

Thanks for the answer, increase for both shipping and Sales price.
But I have checked similar question on the VM forum it seems that there is no solution...

http://forum.virtuemart.net/index.php?action=search2

Thanks if you have any idea!

Best regards
Joomlis