Group actions on categories

It is possible to change permissions of several categories and their child categories and articles at a time. To do this:

Go to Articles > Articles & Categories.

Select desired categories by marking checkboxes next to them. If you would like to select all categories, click on the checkbox next to the root node - "Knowledgebase".

Then click the "Edit" button.

You will see a new window where you can select what objects need new permissions and what new permissions would be.

You can read about the difference between "add groups" and "replace groups" here.