---
title: "Creating and Managing Rules"
canonical: "https://docs.infoblox.com/space/netmri760/357238351/Creating%20and%20Managing%20Rules"
format: markdown
---
*You use the ****Rules**** tab (****Config**** ****Management**** > ****Policy**** ****Design**** ****Center**** > ****Rules**** tab) to create and manage rules that are referenced in policies. Policies cannot operate without at least one Rule. All factory-defined rules on this page are read-only. You can also define your own custom rules, using your choice of editing tools.*  
*Rules provide substantial extensions in capabilities for XML rule creation. For more information, see **[Policy Rule XML Capabilities](https://infoblox-docs.atlassian.net/wiki/spaces/netmri760/pages/357238623)**.*  
*Rule editing features are enabled only when creating a new rule. All other Rules are read-only and can be used only to create new Rules.*  
*Rules are the critical element in building all Policies. To build Rules effectively, Infoblox recommends detailed knowledge of the given networking technologies or protocols involved in defining the rule.*  
*Also, see **[Additional Rule Examples](https://infoblox-docs.atlassian.net/wiki/spaces/netmri760/pages/357205768)**[ ](#)*for information showing how rules appear in practice.

For a selected rule, check **Used** **in** **these** **policies** at the bottom of the center panel to see which policies reference the rule.