Cascading dropdown in sharepoint list

1. How do I create a cascading drop down list?

How do I create a cascading drop down list?

In the same or in another spreadsheet, select a cell or several cells in which you want your primary drop-down list to appear. Go to the Data tab, click Data Validation and set up a drop-down list based on a named range in the usual way by selecting List under Allow and entering the range name in the Source box.