Yes you can. Select an impedance measure in the list and use the right mouse button to edit it.



Impedence Panel


Select the reflex you’d like to highlight as threshold and use the right mouse button to mark it.



Mark as threashold



Save the modified result and see how it appears in the graph.



Threashold Graph


This feature is not available in the webviewer.  
Audiqueen's webviewer displays the results entered in Audiqueen's Workstations.