Select FileOpen from the main menu bar if you are already in an Abaqus/CAE or Abaqus/Viewer session. The Open Database dialog box is shown. Select Output Database (*. odb) from the File Filter list at the bottom of the Open Database dialog box.
In addition, this tutorial might be an asset, have a look: https://www.youtube.com/watch?v=RlBxvG_qsUU