Defining Text Box templates in Powerpoint (2016)

I have text of several types (e.g. citations, image captions, etc) that I need to insert into my slides. I would like to create a template text box for each, so that I don't have to apply the different sets of formatting to each type of text. However, I see that one can only define a default text box, rather than several types/styles of text box. Is there a workaround for this? I could of course use titles and subtitles as elements in the standard Layout of a slide, and customise them from the Master View, but I would like to have more liberty than that, i.e. to create several types of text box, each from its own separate template.

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