OpenVPN installed using Amazon AMI, route only some traffic through the VPN

Used this AMI ami-b7418dd7

followed this guide: https://docs.openvpn.net/how-to-tutorialsguides/virtual-platforms/amazon-ec2-appliance-ami-quick-start-guide/

Now, when a user coects to the VPN I want all of their normal internet traffic to go through the public internet, but when they are trying to access one of our internal systems I want that traffic to go through the VPN.

How?

I've seen a lot of other answers, and I've found very few of them helpful. On this official AMI from openvpn, I can't find any server.conf or client.conf files that so many answers seem to point toward.

Any help appreciated, this is the single stupidest task to be given as a software engineer, not an IT / systems-administrator.