How can I apply promotional rule to customer group price or special price. As default magento apply promotional rule always on base price of product and then after it is using lowest value to use.
For eg product has price of $50 and for particular customer group price is set to $40. And we do have one promotional rule to apply 10% discount. But now here the case is if we login with that customer group customer then magento apply that promotional rule on base price which is $50 which is ideally not proper. It should apply that promotional rule on $40 as we logged in with customer group and it has price set as $40.
So here my requinment is to apply promotional rule on customer group price instead of base price. So how can I achieve it in magento .
Please help me out with this. Thanks in advance.