有谁知道如何将Magento的折扣分组？如何设置每组的最大总折扣？以及如何设置最大总折扣？例如:
Discount Group 1:
a. Early Bird Discount = 10%
b. Member of ABC Organization = 8%
c. Member of BCD Organization = 5%
-----Total Maximum discount for this discount group = 15%
Discount Group 2:
a. Buy more than 5 items = 10%
b. Member of DFG Organization = 5%
c. Member of ASD Organization = 5%
-----Total Maximum discount for this discount group = 15%
-----Total Maximum discount for ALL discount group = 25%