OpenVPN Allowed Client Configs GUI

I'm moving my Openvpn server instance over to my Asus router. I've got everything working but had some questions regarding the gui interface and what it puts in the ccd file contents. It's not what I had expected and am wondering what others would recommend to use for my situation.

I'm referring to the 'Allowed Clients' section of the advanced openvpn server configuration options. (Username, IP Address, Subnet Mask, Push, Add/Delete)

I originally thought the IP and subnet mask were for...

OpenVPN Allowed Client Configs GUI