Okay, you are actually asking two separate questions and so I will address each one separately.
Since your judgment is an out of state judgment, it can indeed be enforced in New York where you live as long as the proper procedures are followed. Since it was a default judgment, the creditor needs to file a Motion for Summary Judgment in lieu of complaint in NY or start a new lawsuit in New York in order for that judgment to be enforced.
Now, once they get the legal ability to enforce the judgment, they can then pursue garnishment. In order to do that, they courts have to have personal jurisdiction
and since you live in NY, that would be NY. Since a client is not an employer they cannot garnish directly from the client. They can, however, garnish your bank accounts, assets, money owed to you, etc.
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