Which tool should be used to transfer a detail from a drafting view to another project?

The correct option is to use the "Insert Views from File" tool when transferring a detail from a drafting view to another project. This tool allows you to import an entire drafting view, including all elements contained within that view, directly into another Revit project. It effectively carries over the design intent and specifics of the detail you want to replicate, ensuring that you maintain the integrity of the original details in the new project.

The "Insert 2D Elements from File" option does not transfer complete drafting views but rather allows for the inclusion of 2D elements, which may not retain all relevant details. "Link Revit" is used primarily for linking entire Revit models and would not be appropriate for transferring a specific detail. Similarly, creating a "Detail Group" is more about grouping elements within the same project rather than transferring between different projects, limiting its functionality in this context.

Thus, the "Insert Views from File" tool is uniquely suited for this purpose by simplifying the transfer process of detailed information while preserving the overall structure and design.