Went through the manual and quick reference guide, and must be overlooking how to unassign line (4)from its line button to then assign line (5) to the line (4) button on a partner 6button. I've assigned line (5) to the extension, but it is not showing up on the line buttons. I've unassigned all 4 of the existing lines and assigned line (5)#301. When I check the line buttons they do nothing. Any suggestions on how to route the line (5) directly to a specific line button on a Partner 6 button. Thanks in advance!