This page explains how to manage object data for object types.Click on "Object data" in the menu on the left. You get an overview of all Categories in which you want to categorize the object data. By clicking on + you can add a new category.
Each category has a number of entry fields that you want to be able to enter. Click behind a category to see the entry fields that are already available. You can change the name of the category and by clicking on + you can add an entry field. You can delete an entry field via the "trash can" button. Behind each input field is an icon with which you can move an input field so that you can determine the order yourself.