See: What is a publication. Then, do the following to create a new publication in the Publications list:
In the Navigation Pane, click Lists, and then click Publications.
Do one of the following:
On the Insert toolbar, click .
On the Insert menu, click Publication.
A new publication is added with empty fields.
In the Publication pane, enter a name in the Name field.
Enter an abbreviation in the Abbreviation field, and appropriate content in the other fields.
Publications stored in the Publications list are automatically displayed in all the Publish <item> In fields and in the Show As Headword In field (Lexicon Edit).
There is a Publish Entry In field for the entire entry, a Publish Pronunciation In field for each publication, a Publish Sense In field for each sense, a Publish Example In field for each example, and a Publish Picture In field for each picture.
This means that all lexical entries, pronunciations, senses, examples and pictures are assumed to be publishable by default.
Choose Publish In field publications
Choose Show As Headword In field publications