|8.3.6.Work with Text in the Text Pane|
Click the SmartArt graphic.
Click the Design tab under SmartArt Tools.
Click the Text Pane button to show the Text pane.
At the end of a line, press Enter to add a new line
Click the Promote button to indent line right.
Click the Demote button to indent line left
Select the line text, and then press Delete to delete a line.