Currently my query looks like this:
SELECT tblClients.numTransactionID, tblClients.numDirectAccounts, tblTransFTE.numFTEID, tblFTE.numFTECatID, tblTransFTE.numVolume, tblFTE.numPMO, Sum(IIf([numVolume]=0,[tblClients].[numDirectAccounts],[numVolume])*0.2/12/[tblFTE].[numPMO]) AS [Call center]...