Answer:
A load that was accidentally applied in the wrong load case can be copied from one load case to another using the table with the area "3. Loads".
In the table, select the type of load that you want to transfer from one load case to another. In the subsequent graphic, these are the "member loads", for example. Then, select and right-click the row describing this load. A shortcut menu appears where you can select "Copy". As an alternative, you can use the keyboard shortcut "Ctrl + C" directly after selecting the row.
After copying the row to the clipboard, you can switch to the "Target load case" in the table area and paste the entry from the clipboard using "Ctrl + V".
Note : This procedure is not possible for the generated loads.