How to: Add a text label to Slide master.
Solution:
Use the 'Text Tool' from the 'Standard' toolbar, in 'Slide Master' view.
Do the following to add a text label:
1) Move to 'Slide Master' view:
a) Select the 'View' menu and select 'Master'. (The Master submenu appears.)
b) Select 'Slide Master'. (The Slide Master slide appears.)
2) Click 'Text Tool' toolbar button (the capital 'A') from the 'Standard' toolbar.
Text Tool button
3) Move the mouse pointer to the desired location for the text label.
4) Click left mouse button. (The cursor appears.)
5) Type the desired label text.
6) Click outside the label box to continue editing the organization chart.