A bookmark will function as an interactive table of contents for your PDF.

The Bookmark management area can be located on the Left Auxiliary Panel. Click Add to create your first entry. You will have created your first Parent in your bookmark family. We recommend you rename your entry to make sure there is no confusion.  

You can right-click on the Parent to access the ways you can interact with it. Choose Rename. 

You will be able to enter your new name here. Click outside the box to confirm your new name.  

When you next click on your Parent it will bring you to that page.  

You can create Siblings, which are other Parents appearing before or after your original Parent entry. 

To create an additional Parent right click on your entry and choose Add Before or Add After.  

You will see your new entry appear accordingly: 

You do not have to apply an action to any Parent. You can create subsections appearing under each Parent creating your customized navigation tree. Right-click on any Parent and choose the Add Child option. 

You will see the Child appear under the Parent you selected.  

Since they are links you can also choose any applicable link actions.