When you want to show details in a view that are not directly associated with the building model, create a drafting view.
View tabCreate panel (Drafting View)
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About Drafting Views
Use a drafting view to create unassociated, view-specific details that are not part of the modeled design.
Create a Drafting View
Create a drafting view to provide details that are not part of the building model. Use the detailing tools on the Annotate tab to sketch the details.
Import a Drafting View From Another CAD Program
You can import a view from another CAD program and use it as a Revit drafting view. Then you can reference the drafting view for a callout or section, and place it on sheets in the construction documentation set.
Reference a Drafting View
When creating a detail callout from a section, plan, or elevation view, you select Reference Other View to reference any detail or drafting view listed in the Project Browser. In this way, you can link the view to a particular area of the building model.