SQL Server 2014 :: How To Sum And Group Data

I want to group the following data attached by CUSTACCT, YEAR, PERIOD(month). As you can see in the attached example, I see duplicates for late fees and Exchange fees but none for FLIGHT_HRS. I want to see the data grouped by CUSTACCT by YEAR then by PERIOD for each of these: FLIGHTHRSSUM, LATEFEESUM, EXCHFEESUM without duplicates.

Is this possible?

This is my current SQL

SELECT dbo.VIEW_FLIGHT_HRS_TOT.YEAR AS FLTHRSYEAR, dbo.VIEW_FLIGHT_HRS_TOT.PERIOD AS FLTHRSPERIOD, dbo.VIEW_FLIGHT_HRS_TOT.FLIGHTHRSSUM,
dbo.VIEW_LATE_FEES_TOT.PERIOD AS LATEFEEPERIOD, dbo.VIEW_LATE_FEES_TOT.YEAR AS LATEFEEYEAR, dbo.VIEW_LATE_FEES_TOT.LATEFEESUM,

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