From firmware 6.5.4.x, the feature WAN GroupVPN doesn't appear preconfigured in the VPN section anymore:
This article describes how to manually enable this functionality.
In order to bring back the function WAN GroupVPN, please follow the next steps:

NOTE: to configure the WAN GroupVPN, please follow this KB Article:
How to Configure WAN GroupVPN on the SonicWall to connect using Global VPN Client?