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That would require that you "domesticate" the judgment in California (where the judgment debtor lives). The form for that can be found here: http://www.courts.ca.gov/documents/ej105.pdf
Under the SSMJA (beginning at Code of Civil Procedure 1710.10), a money judgment obtained in another state may be filed with a California court and a California judgment is entered immediately. Once served on the judgment debtor, it becomes enforceable, and a writ of execution is generally issued.
After service of the judgment, the judgment debtor has 30 days to file and serve a motion to vacate the judgment. But the judgment may only be vacated upon certain specified and proven grounds: (1) the most common: the sister state court (that entered the judgment) lacked either subject matter or personal jurisdiction over the defendant; (2) there is an appeal of the judgment pending in the sister state; (3) the sister state court has granted a stay of enforcement, or (4) there is a motion to vacate the judgment pending in the sister state.
You can also find the nearest self help center to assist you in filling it out and filing it. Here's a link to find the nearest one: https://www.google.com/maps/d/viewer?mid=zEhweSNEO0H8.kBwpt5_HjQ9A&hl=en_US
Hope that clears things up a bit. If you have any other questions, please let me know. If not, and you have not yet, please rate my answer AND press the "submit" button, if applicable. Please note that I don't get any credit for the time and effort that I spent on this answer unless and until you rate it positively (3 or more stars). Thank you, ***** ***** luck to you!