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I did it this way and when using "Turabian Author-Date.fmt" it appears:

(Pl.) - as a citation in the text

Pl. Tim. - in the bibliography.

What I need is to quote in the text and footnotes the abbreviated form "Plot. Tim." when using the Author-Date style ... maybe it is not possible in this ...

In my paper I am using the “Turabian Author-Date” for modern authors and it works well.

However, I need to quote the ancients authors and their works in an abbreviated form, for ex.
Pl., Tim. for Plato, Timaeus.

How can I do that? Should I create a new format? (Biblio, Formats Manager)?
Thank ...