1. Initial situation
In order to quickly select from predefined values in individual cells, you want to create a drop-down list.
2. Instructions
- Create a list of the source values (either in the same or in a different worksheet)
 - Navigate to the cell in which you want the dropdown to appear
 - In the ribbon bar now select: Check> Validity check> Settings: Fixed list entries
 - Select the list created above as the source and confirm.