Child support often is paid via a deduction from wages. The child support enforcement agency likely will serve the order on your employer, if it knows who you work for. You would have to disclose details of your current employment at any child support hearing/proceeding and if you failed to appear, that likely would be bad news for you legally.
Now, if your current employment is temporary and your weekly work hours variable (as happens in retail and in food service industries), you may want to petition for a modification of the monthly obligation based upon your current wages versus whatever figure was used in the original order.
You do not want to look like you are voluntarily reducing your wages. If your previous job also was temporary, was that clearly noted at the time of the original child support proceeding?