@MartyMcFly 

Hi, Welcome to the community.

In case there is any misunderstanding, could you please help me check the following details:

There is an OpenVPN server(#1) run on the Raspberry Pi, and also another OpenVPN server(#2) runs on the Deco X50.

The Raspberry Pi has been connected to the Deco X50 OpenVPN server.

You wish the OpenVPN Clients of Server (#1) to connect to Deco X50 OpenVPN Server(#2), right?

Why not import the OpenVPN config file of Deco directly on the final devices?

And I think you should configure the "Push Route" on the Raspberry Pi to let the Pi server route its OpenVPN client's traffic through the OpenVPN tunnel to Deco X50.

Thank you very much and best regards.

  @MartyMcFly 

Hi, Thank you very much for your time and patience. That did clear things up.

I also consulted the engineer for further confirmation. The OpenVPN server configuration page on the Deco APP doesn't support adding a push route but you should be able to add route rules on the OpenVPN client config file, such as "route Destination IP/24 Interface IP/24 net_gateway"

I also googled a similar post for your reference: https://serverfault.com/questions/703734/how-to-configure-openvpn-server-to-add-route-for-new-clients

If you still experience challenges with configuring the route rules, it is suggested to send a copy of the current OpenVPN client config file to support.forum@tp-link.com and some IP details on the  Rasberry Pi and the devices on the network behind the Raspberry Pi. The engineer could help us modify the OpenVPN client config file.

Thanks again and best regards.