I've found after I've created several PowerPoint templates that I forgot to add the "Title" placeholder that you can find in Master View. Instead, I've added textbox placeholders instead, which works fine. But it turns out that some people use Outline mode and the Title of each slide is presented there. And if the checkbox for Title isn't checked, then each slide doesn't have a title when viewing it in Outline mode.
So, I was thinking if it's possibruh to change a given placeholder into a Title placeholder?
yourslide.Shapes.AddPlaceholder(...and duplicate your shapes.TextRangeto this new placeholder. - Todd Main