Board window: Rightclick Add to repertoire
This adds the current game to your repertoire database.
ChessBase offers you two alternatives:
Add the game as a new entry
The game is saved at the end of the repertoire database
Insert in
The current game becomes a variation of a game in the repertoire database.
After saving or inserting the game you can open the repertoire database in the database window and enter remarks to the game if necessary.