TOC 1, TOC 2, TOC 3, etc., are built-in styles that you cannot delete or overwrite. You can modify them. Those are the styles that are applied to various levels in the TOC. They have nothing to do with formatting of text in the body of the document.

• TOC Tips and Tricks by Suzanne Barnhill, MVP

Generally, the easy way to modify one of these TOC # styles is to just change the paragraph formatting for one entry in your TOC and OK your way back. By default, the style will update. For styles with numbering or bullets, you change the indents by using the define new multilevel list dialog.

• How to create numbered headings or outline numbering in Ribbon Versions of Word by Shauna Kelly
• Number Alignment 2007 and later by Suzanne Barnhill, MVP

Usually one does not generate styles instead applies them. You can create or modify a style.