Constants are data sources with a fixed value. Their value is not calculated while a process is running, but is defined by the user when creating a data flow.
Delete constants that are no longer needed.
Procedure
Activate the Variables and constants bar.
Activate the Constants tab.
Select the constant you want to delete.
Click Delete.
Click Yes to confirm. If the constant is used, you are asked again whether you want to delete it. If you confirm the question with Yes, the constant will be deleted.
You have deleted a constant.