Repetitive text formatting is a huge time waster, and even using paragraph and character styles is a bore when you have to apply them over and over again. But by using InDesign’s nested styles, you can bypass a lot of this tedium.
Nested styles sound more complicated than they are. In fact, they’re nothing more than a series of regular old character styles, with the transition from one to the next triggered by a character or command InDesign encounters in the text stream.
What makes these styles “nested” is that they’re part of a paragraph style, which when applied, causes the whole parade of character styles to be applied at once. You can also cause these sequences to loop back and start the series again. In one fell swoop, you can format listings, catalogs, tables of contents: anything with a predictable and repetitive structure.