We can modify the ladder length also add rugs or delete rugs, resequencing the ladder number. 

We Can Edit Ladder Three Type

  • Add Rung
  • Revise Ladder
  • Renumber Ladder Reference 

Add Rung 
For add rung we need to select the two point between bus .
Schematic > Edit Ladder  edit l > Add Rung > Select The  Point In Bus  

Revise Ladder
In revise ladder we can modify the rung spacing, rung count and starting rung number.
Schematic > Edit Ladder  edit l > Revise Ladder 

Renumber Ladder
We can renumber of ladders in a single drawing or multiple drawing projects at a time.
Schematic > Edit Ladder  edit l > Renumber Ladder