Click "Window" and select "Mix" to view the "Mix" window.
Click the vocal track name to highlight it.
Click "Track" and select "Make Inactive." Doing so will gray-out the vocal track and make it inactive within your Pro Tools 7 session. If you wish to bring the vocals back, simply highlight the vocal track, click "Track" and select "Make Active."
Click "Window" and select "Mix" to view the "Mix" window.
Click the vocal track name to highlight it.
Click "Track" and select "Delete." After doing so, the vocal track will be removed from your Pro Tools 7 session.