Press Ctrl+A; or from the Mode menu, select Add; or click on the toolbar to begin adding cases at the end of the data file.
This will begin a new Add mode session. You may add as many cases as you like. To end the session, press Esc or Ctrl+S. Depending on where you are in the case and if the partial feature is allowed will determine what will happen next.
If you have not yet begun keying a new case: pressing Esc or Ctrl+S will exit the add mode.
If you have begun keying a new case, but have not finished keying the IDs for that case: pressing Esc or Ctrl+S will present you with a dialog, asking if you want to discard the changes you have made, or cancel the stop request (which will return you to your form where you left off).
If you have begun keying a new case and have finished keying the IDs for that case, and partial cases are allowed, the partial save button will be active. Selecting it will save the case and indicate it is partially saved from add mode by the icon in the file tree.