Cascaded Selections help you to set options connected to another selection field depending on what is selected previously.
To set cascaded selections for a selection field, you must first create at least 2 selection fields in the Design Mode.
Select field "Minor Category" and check the Set Cascaded Selections box, then select "Major Category" from the drop-down menu.
Click on the Set button, a pop-up menu will display all options of the referenced selection field. You can add the cascaded selections to each parent option. Each cascaded selection must be written on one line each.
Don't forget to click on the Save button after you finished.
It is possible to set cascaded selections referring to a field already with cascaded selections, so you can have a chain of cascaded selections.
Note: Both the parent selection field and the child selection field need to be added to the listing page if you would like to display one of them there. If you do not want one of those fields displayed on the listing page, you may apply the hidden attribute to that field.