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The functionality can be found in the buildup of a Calculation View which is opened with "Analyze/Compare".
The Commenting of Components can be opened with the button in the toolbar.
In the side panel, it is possible to add comments to every Component. Here you can also switch the language and save the comments.
The comments are integrated into the word and excel documentation.
If a component has a comment is displayed with a bubble on the left side.
From there you are able to delete the comments of the components.