Important note:
In order for a Category to appear on the widget its status needs to be set to ONLINE.
On the below example you can see how a Multilevel Category is shown on the widget.
Example: The experiences offered by a hotel are Wellness and Gastronomy.
"Experiences" is the name entered for the Multilevel Category
"Wellness" and "Gastronomy" are the two Groups of Categories that have been included in the specific multilevel category named "Experiences"
By clicking into one of the above Group of Categories (e.g. Wellness), the relevant product categories are shown (Spa and Fitness in this case):
Then, by clicking into one of the above Product Categories (e.g Spa), the specific products that have been associated to this specific product category are shown:
To find out how to create a multilevel widget click on the following link How to create a multilevel widget.