In the Piano Roll editor, at the bottom there is a Plus sign (next to the Transform button), Click it. In the MIDI Event Type dialog make sure Control is selected for Type and in the Value box, type 103 by itself. Then press OK(or hit enter). Should make a new CC channel you can use. You don't have to use the drop down. Just type the number.
Then select it (instead of Velocity) and draw any control events you want with the pencil.
Or use the Event Viewer and enter exactly what you want at the time you want it.