Create Two List,
Customize the Employee Form.
change the Department from textbox to dropdown.
To make your dropdown start with “-” on new, set the card default from:
If(frm.Mode = FormMode.New, “-“, ThisItem.Department)
If your list has a lookup column
to display item in a choice field use Items: Choices([@Submissions].ColName)
for datacard Update: colName_Choice_Val_3.Selected