JDF 86 (PDF) - Instructions for Issuing a Subpoena (Case outside Colorado)
JDF 80 (PDF) - District Court Subpoena
JDF 80.3 (PDF) - Subpoena Affidavit
JDF 87 (PDF) - Request to Issue Subpoena (Case outside Colorado)
JDF 98 (PDF) - Affidavit of Service
You will need separate forms, start an individual case, and pay the filing fee for each subpoena you must issue.