To summon this dialog box, click the Insert tab, and then choose Explore Quick Parts→Field.The Explore Quick Parts button is found in the Text group.
These categories represent various dynamic scraps of text you can insert into your document.
Using Word's interface to insert fields is great while you're learning or if you don't remember all of a field's options.
You can access fields as follows: For a complete list of fields, read Field codes in Word.
You can use them to ask questions, make decisions based on specific conditions, and perform calculations.
In this article, I'll show you the basics you need to know to start utilizing this powerful and flexible feature in your Word documents.