https://support.symantec.com/us/en/article.tech253914.html
When vendors want you to do this then they typically publish a document on how to achieve what they ask.
This is from the Symantec Site about how to configure.
Whilst it is for R77.30, configuring VPN's really hasn't changed much, so this is till useful in terms of what to configure.
Please note that says to create Permanent VPN Tunnels and to enable DPD, Dead Peer Detection which is done via the GUIdbedit tool.
This doc refers to a Policy or Domain based VPN so this should answer your question.