To manage categories,

1. Go to the Magento 2 Admin panel.
2. On the left navigation bar, click the OTTO Integration menu.
   The menu appears as shown in the following figure:
   
3. Click on Categories.
   The Manage Categories page appears as shown below:
   
4. All the Categories and Attributes will be displayed here.
5. You can also synchronise the categories and attributes by clicking on Sync Category and Attribute Button.
6. To truncate the categories, click on Truncate Button.