In the documentation
Configuring Charts
... Similar to the Report Parts dialog, you can drag and drop items back and forth between the right and left lists, change the order of the items on the left side by dragging and dropping them.
Well you can do that, that´s right.
But if do this in the root Servers/Devices report section and later look in the report section of a group or server, it will mixed up again. Not every time, but often.
If you have a lot custom charts, sorting via drag and drop is painfull.
Since one of the minor updates, it´s not more possible to break the inheritance in subgroups. The the check box at the top ist missing.
Regards Marco