You can change the number of balusters on the stairs with the  "Change the Baluster Count" command.

  •  Click the Change Baluster Count icon in the ribbon menu  .

  • Select the railing whose number you want to change.

  • In the dialog that opens, you will see the number of balusters available. Enter your new baluster number in the dialog.

  • When you click the OK button to close the dialog, your baluster number will change.