If you have access then this link states: http://cmp-cpm.forces.mil.ca/DHRIM/mhrrp/Ch15/engraph/ch15b_e.asp
12. A member who requests a release from the P Res must do so by completing the “Res F – Application for Voluntary Release/Transfer” at Annex F, Appendix 2. The request for voluntary release should be submitted preferably 6 months prior to the requested release date but no later than 30 days prior to the release date, through the chain of command to the approving release authority.
This particula form has been around since 2009 but I remember completing one in 1999.