The delete option is only available for those rulesets you create in the Rules Manager.
Note
Once you upload the changes made to the DC, the ruleset can not be deleted in the rules manager.
In the Rules Navigator view, select the project node.
The project opens in the Editor Window.
Under the Rulesets section, select the ruleset.
Choose the Delete button.
Note
You can also choose Delete in the context menu of a ruleset.
In the dialog box that appears, choose Ok.