Deleting an Organization Rule 
Use this to delete an existing organization rule.
Caution
Deleting an organization rule invalidates any rule generated from that organization rule.
End of the caution.
Procedure
Choose
Setup 
Exception Access Rules Organization Rules 
.The Organization Rules screen appears.
Choose the Organization Rule ID for the organization rule you want to delete, and then choose Delete.
A confirmation screen appears.
Choose OK.
Choose Close.