How do you create a chained select list in excel? Chained Selects lets you
"chain" multiple form select lists together so that the selection in a
"parent" list can tailor the options available in a "child" list.

I want to "chain" three select lists and have prepared options for them.
It's just like mapping a three-level folder tree to three select lists, the
folders/items at top-level will populate the first select list, and when a
top-level folder is selected, its sub-folders/sub-items will populate the
second select list, and same goes for the third select list.