Deleting a Rule Flow 
You can permanently remove a rule flow from a development component.
Note
If a rule flow is being used in the main flow or any other rule flow, you cannot delete it.
Locate the flow ruleset
For more information, see Locating the Flow Ruleset
Expand the flow ruleset node, the Rule Flows node and in the context menu of any rule flow choose Delete.
In the dialog box that appears, choose Yes.