If you bail out to semi-closed mode you switch the VR3 to what ever gas your breathing on an OC setting and it recomputes the deco. Having made it to the 6m stop and 02 rebreather depth you can then switc back to CCR mode and it will recompute again.
Or if your like me and have Uri's HUD you dont bother as the VR3 linked to cell 1 will track the gas and keep on top of deco calks anyway.
ATB
Mark Gizmo Chase