Then navigate to Campaigns > Campaigns categories and create as many categories as you need. Click the New Category button (1), then click the new item (2) and modify it in right panel (3).
Do not forget to save your changes. In our example, I created 3 main categories and 2 subcategories (you can create it by clicking the main category and then the new category button).
Now, we want to insert one of the campaigns into the category. Navigate to Campaigns > Campaign manager and edit a campaign. In the Overview tab, scroll to the bottom and click the link Change. Choose the category and save.
Your affiliates will see it like this (in affiliate panel):
If you want to translate category name and description, enclose names and descriptions with ## ## signs (e.g.: ##First category name##) and add new translation source into your languages. (Here you can see how to add new translation source into language.)