Navigate to Project > Field Networks > [network type]> Hardware > [device].
Perform either of the following steps to add the points to the Trend Viewer:
Select the Manual navigation check box and thereafter, select the BACnet points. Drag the selected BACnet points to the Trend Viewer.
Select the BACnet points and thereafter, select New Trend from the Related Items pane to open the Trends application in the Secondary pane. Click Edit Trend
.