You can create & add a document outline in Google Docs using this guide. Difference between Table of contents & Document Outline explained.

Once you add relevant headings, you can fly through your Google Docs document from the Summary menu. Once you add relevant headings to your document, click the Show document outline button in the ...

Google Docs is the top online document editor, hands down. If you're working on document, you can quickly create an outline in Google Docs.

Google Docs lets you add headers and footers to your documents and automatically insert elements like page numbers, page count and footnotes.