Hi, I'm looking for a way to connection as follows please:

site 1 with lan 192.168.4.x with a VPN (lan to lan ipsec) to site 2 192.168.1.x

site 2 192.168.1.x has a vpn (lan to lan ipsec) to site 3 10.0.0.x

so from site 1 i need to go through site 2 to reach a site it connects to through a vpn to site 3

I wasn't sure if i need to add the site 2 lan IP's to my von "more" settings AND a static route or if there is something more.

site 1 can connect to site 2 lan devices, i just now need to connect through site 2 to site 3 to the devices on that far end

Really hope this makes sense
Any advise will be appreciated

The "More" option for LAN to LAN VPNs is actually how to define static routes for VPNs, so it does need to be set there and not in the Static Route menu.

That should work though:
Site 1 would have Site 2 as the VPN with Site 3's network set via the "More" IP section
Site 2 would simply connect to site 1 & site 3
Site 3 would have Site 2 as the VPN with Site 1's network set via the "More" IP section

If that doesn't work, check firewall settings and make sure that no Policy Route rules are sending that traffic out to the internet directly