summary field help

[Jessica_BLUE]

hi everyone, hope you can help me. i need to create a report, which summarize the hours * price, by part number and also by customer. i currently have a field: reportTimeReqSummary = summary of reportTimeReq (the total of hours by report number) a summary field TotalHours = getsummary(reportTimeReqSummary;partnumber)*customerpriceperhour which gives me the total price by partnumber, i need the total by customer, if i put TotalHoursByCustomer = ReportTimeReqSummary * PricePerHour, gives me the total of ALL customers, instead divides me by customer i dont know what im doing wrong and also if i put getsummary by customers, when i run the report appears 0.