Insert Detail Components from a Saved Detail View

Click Insert tabImport panelInsert from File drop-down (Insert 2D Elements from File).
In the Open dialog, select a project that was saved as a detail view and click Open.
In the Insert 2D Elements dialog, select a view that contains the 2D elements you wish to insert.
This action copies the 2D Detail Components (repeating details, detail lines, insulation, and filled regions) to the new detail view. Although model geometry is not copied, Revit tries to map the detail components to the new host geometry in the current project. You will probably need to change and edit some of the 2D geometry, but this will give you a head start on your current detail.

The following view-specific elements will not be inserted:

Edit cut profile elements
Elements that cannot be grouped (for example, callout elements that create callout views)
Elements that reference stair railing elements
Elements that reference toposolid elements
Elements that reference in-place families
Elements that reference any elements in this list (for example, dimensions)