Use the Rules tab of either the Pipe Properties or the Structure Properties dialog box to edit the values for rules associated with a part in a pipe network.
Editing the rule values for a part in a drawing affects only the currently selected part in your drawing. It does not affect the definition of the part as it exists in the pipe network part catalog.
You can also edit rules as they are defined for a rule set in the Settings tree. For example, in the Toolspace Settings tree 
PipePipe Rule Set collection, you can add rules, remove rules, or edit rule values for a particular rule set. This provides a convenient method for creating rule sets intended for a specific pipe network or project.
For example, you could create a rule set that has the Length Check rule value set to a certain value. You could do the same for the Cover and Slope rule.
To edit rule values for a part in a pipe network
- In the drawing, right-click either a pipe or structure in a pipe network, and then click either Pipe Properties or Structure Properties.
- Click the Rules tab.
- Select the value of the rule you want to edit and enter a new value.
- Click Apply or OK to save the changes.
To add, remove, or edit rules in a rule set
- In Toolspace, on the Settings tab, expand either the Pipe or Structure collection.
- Expand either the Pipe Rule Set or Structure Rule Set collection
- Double-click a rule set. The Pipe or Structure Rule Set dialog box is displayed.
- Click the Rules tab.
Add or delete rules by clicking Add Rule or Delete Rule. Edit a rule value by clicking on the value and entering a new value.
- Click Apply or OK to save the changes.