If you want rebuild your opening repertoire completely you should make a backup copy of the existing repertoire.

 

In the first step, save the existing repertoire on the hard disk.

 

After opening the repertoire – with Load White/Load Black – you can always save it in a database of your choice.

 

Click on "File" -> "Save" or on "File" -> "Save as" and select the database of your choice.

 

When you save the database you should give your repertoire a name that is easy to remember and to find again.

 

 

After the backup copy is created, you can delete the existing repertoire.

 

Load the repertoire under "My Moves" and bring the cursor to the first move. Now, clicking the cursor leads to the starting position.

 

Now choose "Delete Rest" in the toolbox below the notation.