They can do what they do in any other case.

If I smashed my car into your house and you sued me and won $100,000 judgment And I refused to pay you, you can garnish my wages or my bank accounts, you could put a lien on my property. You can get the Sheriff to execute the judgement on your behalf.

You can inform the enforcement officer that you wish to request an execution from the court. An execution order allows them to seize money or property from the defendant to ensure the judgment is paid.

I'm sure Trump will put up the money and appeal.