I would apply for help with the Arizona Department of Economic Security. They have better tools for enforcing child support than the family court, for example they can intercept tax refunds. There is the link to their web site to apply on line for help. https://www.azdes.gov/az_child_support/
As counsel mentioned, you can apply for help from DES. Also, you can request the Court to make new orders that specify that the parent company needs to be garnishing wages, and not each individual store.
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You can file a Petition to Enforce and Order to show cause. If he has not paid in a year the matter should be referred to accountability court which would be a more appropriate venue to deal with this type of situation. The payor would be required to keep coming back to court to prove compliance with the order. Accountability court is not available in every situation.
As counsel correctly points out, the company should have a main human resources department that could assist you in this situation.