From a PAN standpoint you would simply add a Proxy ID for both networks and you wouldn't need to create a separate tunnel. It's been a while since I was forced to manage anything SonicWall and I know they've changed SonicOS quite a bit since then, so I don't really have a direct answer from you on that end. From a brief glance it looks like it's only capable of specifying one network per tunnel on their end, so you would have to create two separate tunnels.
Someone with more current experience on SonicWall hardware may be able to offer more guidance on that end of the configuration. I thought they had introduced a route-based VPN configuration option in newer SonicOS releases, which would allow you to setup a tunnel "normal" from PANs side and you would simply create a route directing traffic to utilize the tunnel when needed. However, I'm not sure if that was actually implemented or if their implementation would play well with PANs.
For the IPSec VPN configuration about Sangfor, I find an introduction video on their official YouTube Channel.
Hope this one will be helpful.
From my experience, most of the time, we just need to clear the set of options we gonna use(IKE setting, subnet etc.) and follow the guidance of configuration, it will do the job.
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