https://www.youtube.com/watch?v=SrWKY4u1a_4

Matching lengths of several traces

  Assign color command to the traces to be matched

  Launch Constraint Manager

  Go to Electrical workbook ... Net ... Routing ... Total Etch Length

  Colored nets show up

  Select nets, make a class, give it a name

  Rt mouse button on the name ... analyze ... gives the actual lengths

  Could now put an over-riding value in the class name Min and Max

Making a rule set

  Go to Electrical Constraint Set ... Routing ... Total Etch Length

  Rt mouse button select "schedule_phase_dyn..."

  Create Electrical CSet dialog box opens

  Give it a name

  Then specify values in column that opens up: Minimum Total Etch and Maximum Total Etch

  The advantage is when you go back to Electrical Constraint Set...Net...Total Etch Length
    and apply that rule set ( by right mouse button clicking on the net class name ),
    then if a change is needed, all the min/max settings can be done back in the 
    Electrical Constraint Set ... Routing ... Total Etch Length setting
  
  Minimize Constraint Manager

  Back in the pcb window, the trace lengths that don't conform have DRC error bow-ties

  To start matching the lengths, hover over the DRC; it will display the constraint value and the actual value

  Go to menu Route...Delay Tune 

  Hover over the trace, right mouse button, delay tune

  As you drag the line, accordian track appears, heads up display goes from red to green 
    when length meets constraint value, click to confirm
  
  Do this for each DRC bow-tie trace

  Go back to Constraint Manager, all the nets should be green