Linked Channels
Linked channels lets you connect special channels like threads or forums to features where it's supported. You are limited to 20 linked channels, or 100 with premium.
Linked channel support is limited. Only channel selects with a Channel not listed... option support linking.
Linking Channels
In any channel select with support for linked channels, you select Channel not listed.... This opens a popup with a command. Run this command in the channel you want to connect, and it should then be connected and automatically selected. Running the command requires the Manage Server permission.
Linking Channels In Other Servers
Linked channels support sending messages to other Discord servers that have granted the write_channels cross guild permission.
Managing Linked Channels
Currently linked channels can be deleted and found in the Settings section of the dashboard. Removing a linked channel that's still in use may reset the affected feature to its default channel or disable it until a new channel is provided.