hello everybody
i want to ask you that in my shop , i want to set condition like people should buy goods which are more than 6 KG.

can i do that ??
n how ??

if anybody buys goods of 3 KG...they cannot proceed further....

and i want to set price fro weight that means if somebody buys goods of 6 KG, then they have to pay S20 if anybody buys goods of say 10 KG, they have to pay $36

please anybody need help over here....