I called, provided the flight details and they linked the two legs. Reduced the charge to that of the full journey.
Yes that is exactly what I wanted and I swear I had done it pre-covid to arrange some layovers - i'll try calling again tomorrow and speak to someone else.
Reason for booking with Velocity is it prices at 65k vs 62k for Krisflyer - to me the KF miles are much more valuable as they are harder to obtain.