Here you will administer data for "Overview - Per shift". This means that you will pick a time interval for a shift and these can vary in zise depending on your needs. For instance you can set up a short shift for only one hour like 08.00 - 09.00 or a shift that will last for half a day 08.00 - 12.00. Go to "Client" -> "View" -> "Overview" -> "Per shift" to set this up.