Share head office internet for remote office through exist IPsec VPN

Hi,  I have a existing IPsec tunnel between head office (FG60E) and remote office (FG60D) for file sharing. At the moment existing tunnel is working fine from both side. Both device has v5.6.2 build1486   Now I got a requirement to route all the internet traffic from remote office device to head office device through existing tunnel.    I followed this configuration [link=https://help.fortinet.com/fos60hlp/60/Content/FortiOS/fortigate-ipsecvpn/Internet_Browsing_Config/Config_Overview.htm]https://help.fortinet.com...ig/Config_Overview.htm[/link] but internet is not working   1. Create one security policy        2. Edit the default route in remote device to traffic internet through IPsec Interface Once I change the default route in remote device, all the traffic pass through VPN interface but internet is not working maybe not passing through head office device.  I am not expert the firewall, Any guidance appreciated  Thanks.