When you first launch the OTbase Discovery configuration client, you will automatically see a list of local networks that Discovery can reach directly, without routing.
In addition to this list you can also discover remote networks that you can route into. Naturally, those networks are not listed by default because OTbase Discovery doesn't know about them. But you can add them manually.
When you select the top entry (node level), bring up the context menu with right-click. In the context menu, select Add remote network.
You can then enter the network address of the remote network in CIDR format. That's it! Click on OK and your remote network will be added to the network list.