A family of Microsoft word processing software products for creating web, email, and print documents.
Even now, it would probably be best to modify the default Heading Styles (Heading 1, Heading 2, etc.) so that they had the formatting attributes required by the granting agency.
However, to have the text in styles that you defined appear in the Table of Contents, from the Table of Contents dropdown in the Table of Contents section of the References tab of the ribbon, click on Custom Table of Contents and in the Table of Contents dialog, click on the Options button and then locate the styles that you created from the list of available styles and then assign to each of them the appropriate TOC level.