How to add categories on a page
52414
Can a Child Category Have More than One Parent?
125456
Adding categories to custom post type in permalink
124250
Add meta box to WordPress options page
73363
Add child pages automatically to nav menu
93849
Is there any way I can organize my favorite questions on StackOverflow using self-defined categories?
37660
How can I make a clickable Table of Contents?
131426
How do you add CSS with Javascript?
78362
Centering \section* and adding them to the ToC
27327
Force category choice before creating new post?
38864
How to add a category to Magento via Setup script?
99533
How can I add HTML tags into menu title?
157467
Add custom field to Category
150110
How to change the order of the subcategory and category in a post?
37725
How do I add a DOM element with jQuery?
140390
Add 'Page' above page numbers in Table of Contents
143377
How to modify the page at admin/structure/types?
52734
How to add an extra level of sections with headings below \subsubsection