Thanks Gary. It's a good idea for a new presentation. For me, I have a few dozen that when I edit / add to I have to keep doing manually.
I did find this though:
Select a text box and change its font.
*Format > Advanced > Define Text for Current Master* or *Define Text for All Masters*, depending on your needs.
With the former, new text boxes created on slides with that master will use the specified text style.
With the latter, any new text box on any master will.
which seems to help.
Thanks for taking the time to share. This is my first time here and I really appreciate the help.