1st time setting up split tunnel VPN

I have a special case where a remote user is constantly connected to VPN. We do not have the most bandwidth, and also not the most powerful router. They use Google App Sync for Large amounts of data and it is crowding up the internal connection. I want to implement split Tunnel VPN but not sure of some of the details.

So far I understand that the first step is modifying the Advanced IPv4 settings by unchecking the "Use Default Gateway on Remote Network". The next step is to add a static route to our subnet so that they can access our resources once connected to VPN.... right?

Here is a general scenario, I will modify some of these IP's but they are generally this way.

Users home network - 192.168.1.0 /24
Our Network - 192.168.5.0 /24

If I run the print route I get the IF number for the VPN connection when its connected. so Lets say the IF number is 24....

Will running this do the trick?

route add 192.168.5.0 mask 255.255.255.0 0.0.0.0 IF 24 -p

Thanks in advance.