One of the basic processes in Harmony is to create your employees. If you have more than a handful of employees that you need to have created in Harmony, importing them is a good option to mass-create them all at once.
Harmony comes prepackaged with many of the most popular Time Clock / Time Import interfaces out of the box, but it is also possible to create your own should none of them fit your needs.
Standard import & export interfaces are already in the system by default. If you are not looking to import or export anything specific from Harmony T&A, you do not need to set up custom interfaces.