Create two tables of contents: Insert two separate tables of contents into your Word document. One for the Infrastructure category and another for the Parks category.
For headings that should appear in both tables of contents, bookmark them. Once you have bookmarked all the necessary headings, insert input fields into the table of contents. Highlight where you want the heading to be, go to the Insert tab, select Quick Section in the Text group, and then Field. In the dialog box, select Bookmark as the field type and select the desired bookmark from the list.