Legal Question in Civil Litigation in California

Yes, but the normal practice is to use a copying service, they typically issue subpoenas on behalf of attorneys and have portable imaging machines that are brought to the custodian of records.

Actually, if I recall correctly, neither the attorney, any attorney in the same firm, nor any employee of the attorney or firm, can be the "deposition officer" for a custodian of records document subpoena. You have to use an outside service. Depending on whose records are being subpoenaed, you can also have them just make the copies themselves and send them to the deposition officer.