how to use c4.5

I am working on a dataset for suppy chain management,In that i have to use c4.5 for decision making,The dataste consists of 8 fields,id name,cost ,product,seller name,buyer name,etc In this i have to make a decision which product is best depending upon the cost,i have seen c4.5 for classification.but how to make it for decision making,kindly suggest some idea