Oct 01 2019 02:28 PM - edited Oct 01 2019 02:33 PM
Hello @Randy59,
Click on the cell containing the drop-down list. With this cell selected, go under the Data Tab into the section labeled Data Tools. Click Data Validation. Under the settings tab, you will find the source of your list. It can either be an array of cells (i.e. $A$1:$A$10) or a manually input list (i.e. Option 1, Option 2, Option 3,....).
I hope this helps!
PReagan