Oh, I see, your VPN box is not default gateway for 4.4.10.0/26 LAN. It'll be easer if you sketch the network infrastructure, and show OpenVPN server config file.
The easest way is to add a routing to 192.168.10.0/24 network on the 4.4.10.0/26 LAN's gateway. But the NAT must work too, but in this case, none from 4.4.10.0/26 LAN will be able to directly access any VPN client. Also you can use NETMAP option of iptables command, if you are shure that one of the VPN client after mapping will conflict with 4.4.10.0/26 LAN's computers. If you are sure that there will never be more than 8 clients, for example, you can use in OpenVPN server config file the definition of:
server 192.168.10.224 255.255.255.240
and in /etc/sysconfig/iptables
iptables -t nat -A POSTROUTING -d 192.168.10.224/28 -j NETMAP --to 4.4.10.224/28
Something like this. Of course this must be tested, as I'm not sure about iptables correct format.
