Some resource files can be shared among different models or copied in a local model. Modifications that you make to a resource file are applied differently depending on whether the resource file is shared or copied into the model:
Share - Any modifications made to the resource file are shared by other models using this resource file
Copy - The current resource file is independent of the original resource file so modifications made to the resource file in the resource files library are not available to the model. The copied resource file is saved with the model and cannot be used without it.
When you modify a shared resource file, you should always modify a new resource file created from the original resource files shipped with PowerDesigner.
The File Name box allows you to know where the resource file you are modifying is defined: