Record Main Stream (Event) & Substream (Continuous)

IPC: DS-2CD2542FWD
NVR: DS-9632NI-I8

I would like to record both the MainStream (Event) and also the SubStream (continuous) to reduce storage requirements.

Is this possible and if not, would it be possible to record the MainStream to one NVR and SubStream to another DS-9632NI-I8?