As long as the text is in placeholders (not text boxes or AutoShapes), you
can make changes in the Slide Master.
However, even text in placeholders will not change if you have individiually
altered them - in that case, follow the Slide Master change with Format |
Replace Fonts. Replace Fonts does not change font sizes.
Also, you might want to look at RnR ShapeStyles:
http://www.rdpslides.com/pptools/
--
Geetesh Bajaj, Microsoft PowerPoint MVP
http://www.powerpointed.com
PowerPoint Ezine Issue 42
http://www.indezine.com/ppezine/