Cascaded Selection lets you link the options of one Selection field to another Selection field, so the available options change based on the selected value.
For example, when the "Major Category" option is "READY-TO-WEAR", the "Minor Category" options will display "Suits", "Outerwear", "Shirts", "T-shirts", "Pants & Shorts".

To set Cascaded Selections for a Selection field, you must first create at least two Selection fields in Design Mode.
Select the "Minor Category" field, check the Set Cascaded Selections box, and then select "Major Category" from the dropdown.

Click Set, and a window will display all options of the referenced Selection field. You can add the Cascaded Selections to each parent option. Each option must be entered on its own line.

Don't forget to click Save when you finish.

You can also set Cascaded Selections that reference a field that already has Cascaded Selections, creating multiple levels.
You can also Allow User Add New Options. After adding a parent option, users can directly add child options or add new child options under an existing parent option.

Note:
1. To display either field on the Listing Page, both the parent and child Selection fields must be added to it. If you only want one of them displayed, you can hide the other.
2. The Multiple Select field does not support Cascaded Selections.
3. The maximum number of selections in a Cascaded Selection field is 10000. If the limit is exceeded, the Cascaded Selection settings on the field will be reset after you save the sheet design. If you need more than 10000 selections, use Link and Load together with Dynamic Filtering.