To remove a subsidiary, you must set an end date for the company in the ownership distribution.
Note: Do not remove the company from the group structure; the accounting will remain and affect the group consolidation.
Navigate to the ownership distribution by selecting "Administration" -> "Corporate Group".
Click on the three dots (...) behind the company you want to remove from the group.
If you sell the company, select "Divestment" and set an "End date". Then click on "Save".
You will now see an end date in the Ownership Distribution, and the company will no longer be updated in the group consolidation after that date.
If it's the wrong company added to the group, choose "Correction".
Note that this will remove all the information about the company from the group, and it cannot be undone!