Tracks are automatically created when you create instrument devices in the rack. Still, you may need to create additional tracks (e.g. for recording effect device automation):
To create a new sequencer track, pull down the Create menu and select Sequencer Track.
The new track will appear below the currently selected track in the track list. Initially, it will not be connected to any device.
You can also create a new sequencer track specifically for a device by using the Create Sequencer Track for Device item on the device's context menu.
This works the same as when creating a new device, i.e. the new track is connected to the device and has the same name.