Google Sheets Multiple Dependent Dropdown Lists
There is a trick you can use to create multiple dependent drop-down lists on the same sheet in Google sheets. It's simple trick that doesn't involve Apps Script. Check out the full article.
Excel Dependent Drop Down Lists on Every Row
Create multiple dependent drop-down lists in Excel that you can copy to every row. You'll also learn how to exclude the blank cells on the bottom to make sure each list is restricted to the number of categories available.