You can use the same form for adding employees as the one you use for editing data of the existing ones, it's just a parameter when you open the form that needs to be changed:
Code:
'
' Open a form for editing existing records.
'
DoCmd.OpenForm "Form1", , , , acFormEdit
'
' Open a form for adding new records.
'
DoCmd.OpenForm "Form1", , , , acFormAdd
You can also act on several properties of the form: DataEntry, AllowAdditions, AllowEdits. See Access help for details.