Rename

to add a rule definition.
allows you to delete a selected rule.
allows you to modify a selected rule.
Rules are applied in the order in which they were created, so you can change this order by using the arrows.
or
.
Once the rules have been added to the list, simply click on
.
The result allows you to immediately identify the documents that will be affected by this application. These documents change color, and when you click on a document, you can see both the old and new names.
Here, the rule to replace the first 4 characters with " 520- " for part documents is being followed correctly, since assemblies are not affected.
You can still change the final name, if necessary.

Click on
this resets the application of rules to the project. The list returns to its original color.