I have named Doe Defendants and am conducting discovery to get their true names.
Real Estate Attorney
Look at your local rules of practice. You would generally file an amendment to the complaint. Los Angeles, for example, has a specific form for this purpose.
You use the summons you have now. At the bottom, you check the box where it says the person was served as Doe 1.
Lawsuit / Dispute Attorney
Yes, once the defendant's true name is discovered, you must amend the complaint. San Diego has a form as well. Check the forms on your court's website.
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