Customization > Extensibility Through Profiles, Stereotypes, Tag Definitions and Scripts > PTC profiles > PTC profiles > Adding a PTC profile to a model
  
Adding a PTC profile to a model
1. Ensure that you have Database Write access permissions to the Model's Database.
2. Open the Model to which you want to add a PTC Profile.
3. On the Tools menu, click Add Profile.
4. Select the check boxes associated with the PTC Profiles you want to add, and then click OK.
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• Do not make changes to a PTC profile. Any changes you make will be lost when the profile is updated.
Note that you can create Tag Definitions outside of the PTC profile, and link those Tag Definitions to Stereotypes in the PTC profile. When the PTC profile is updated, the links will not be broken.
• Do not create copies of a PTC profile within a model, or create copies of the PTC profile through XMI Import/Export. The copies of the PTC profile will not work correctly and you will not be able to update the copies through the Update All Profiles command.