Fortunately, there’s an easier solution: Modify the built-in table of contents styles. Word’s table of contents styles Word uses a dedicated set of styles to format a table of contents.

We show you how to merge and split cells in Table in Microsoft Word. You can choose the number of rows and columns.

Using Border Painter, you can apply a Border & Shading to a Table and change its Color in Microsoft Word documents. Learn how!

You can use built-in options to build a simple table of contents, but quite often, you'll need to change the underlying field code to get the results you want.