Not only can you make notes on your documents, you can also bookmark certain pages as needed.
ProductionPro Web App:
Scroll to the page in the document you want to bookmark
Click the dropdown menu in the upper left corner, next to the page counter, and click "Bookmarks"
Click "New Bookmark"
Give your bookmark a name
Click "Save"
Your bookmarks will appear listed under this menu; when you click on the bookmark itself, you will automatically jump to that page in the document.
ProductionPro iPad App
Scroll to the page in the document you want to bookmark
Tap the bookmark icon in the upper right corner.
The icon will appear filled in, and a second red icon will also appear on the page's thumbnail at the bottom of the screen.
Similar to the web app, you can also view a list of your bookmarks in the annotation summary menu by tapping the open book icon. Tapping on a bookmark in the summary will automatically jump you to that page in the document.