Multiple Discount Column and Report

We need discount column for different types: Freight Discount, Damage Discount, Scheme Discount,etc and subsequent reports in report section for each of the discount types. So that we know which party has received how much discount. Also the ability to tag a discount type as cost oriented or non cost oriented so that discount should be included or excluded while calculating profit. Sometime we get a discount from our suppliers which we need to pass on to our customers, sometimes we pass on partially, sometimes we dont need to pass at all. There should be a user friendly way of accounting for this type of transaction.