Sum Field Values Only If Another Field Values Meet Criteria

I need for Access only to sum the "hours worked" of my payroll data, only if another field, "pay code" meets a certain criteria.

In Payroll, some codes are used to designate actual hours worked like REG (Regular Hours) and like OTS (Overtime Straight) while other codes are added as "premiums" to these hours and do not mean that you actually worked those hours, like OTP and HOD (Overtime Premium & Holiday Premium). The hours are only added as a reference to the actual hours worked they are attached to. Their units should not be counted as hours worked.

I want Access to 1) Group By Cost Center, 2) Sum "Hours Paid" that are tied to a REG or OTS (only), but 3)Sum the Earnings for all pay types.

Basically, (in excel-like terms: Hours Paid Column= SUMIF of Paycode = REG OR OTS. But Earnings Amount Column= Sum of all Paycodes)

Cost Center
Job Type
Hours Paid
Pay Code
Earnings Amount

20530
Security Guard II
7.5
REG
190.37

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