Deploy/Start Dependencies
Channel Dependencies allow you to mark one channel as a "dependency" of another channel. This means that the dependency channel should be started / deployed before the dependent channel. This could be for a variety of reasons, but one common use-case is when you have one channel sending to another channel. The upstream channel is the dependent, and the downstream would be the dependency.
The tree in the top-half of the dialog shows dependencies of the current channel. In other words, channels that show up in the top tree are those that the current channel depends upon. By expanding nodes in this tree, you can see descendant dependencies, or "dependencies of the dependencies".
The tree in the bottom-half of the dialog shows channels that are dependent on the current channel. By expanding nodes in this tree, you can see descendant dependents, or"channels that are dependent on the channel that is dependent on the current channel".
Select the Add / Remove buttons next to either tree to add or remove direct links.