Header titles

Have a look at the Placeholder Tags List in the Help Menu. It contains the following text about headers and footers…

I’m not sure that you can do this just for selected documents though - I think it’s a Project wide setting.

You can auto-generate synopses for selected documents by selecting them in the binder and choosing Documents > Auto-generate Synopses. The synopsis is taken from the first 500 characters of the text.