Fortinet FortiGate 1U Quick Start Manual page 202

Now select Create Phase 2, set it to use
the new Phase 1, and expand the Advanced
options.
Specify Source address as the HQ subnet
and Destination address as the Branch
subnet.
Adding firewall addresses
for the local and remote
LAN on HQ
Go to Firewall Objects > Address >
Addresses.
Create a local address. Set Type to Subnet,
Subnet/IP Range to the HQ subnet, and
Interface to an internal port.
182 The FortiGate Cookbook 5.0.