No, child support deductions are not reported on your W-2 form since they are not deductible on your return. Box 10, dependent care benefits are amounts your employer paid or incurred for child care. Please view the IRS links below for more information.
Child Support Payments:
https://www.irs.gov/faqs/interest-dividends-other-types-of-income/alimony-child-support-court-awards...
Box 10, Dependent Care Benefits:
https://www.irs.gov/faqs/interest-dividends-other-types-of-income/employee-reimbursements-form-w-2-w...
