To delete a building block, Inserting Ready-Made Document Parts
In the Text group, click Quick Parts, and then click Building Blocks Organizer.
In the Building blocks list, select the building block you want to delete, and then click Delete.
To create a table of contents, Creating and Modifying a Table of Contents
Assuming that the document has paragraphs styled as headings, click where you want to insert the table of contents. Then on the References tab, in the Table of Contents group, click the Table of Contents button.
In the Table of Contents gallery, click the table of contents style you want.
To update a table of contents, Creating and Modifying a Table of Contents
Click in the table of contents. Then ...