The code VRoscioli provided was right on the money. Thanks everyone.
For total adjustments audited:
qryAdjAuditedByCat
SELECT Sum(IIf([Amount]<=-50,1,0)) AS AuditCat1,
Sum(IIf([Amount]>-50 And [Amount]<-15,1,0)) AS AuditCat2,
Sum(IIf([Amount] In (-3.99,-4.99,-10.99),1,0)) AS AuditCat3...