Hello,
You can use Measure variables to observe your process. It's possible to modify/delete them, but BE
CAREFUL : Measures are not versionned. Any change on a measure will modify the way your former version are working.
Possible consequences are: loss of information in process reports, possible disorder in your reports, ...
If you do any change to these element, note somewhere your changes, to do the modifications manually backward. (it will not be possible to just "undo" your modifications.