How to map dofs of VECTOR functions between meshes, boundarymeshes, submeshes?

The current implementation of SubMesh does not support parallel and from what I know, that’s not planned. So I am afraid you cannot use the same approach with a submesh.
However, we are developing a new MeshView class to create submeshes, which holds the mappings that you would need to use the approach suggested by @dokken with a submesh.
We are currently finalizing the development of this feature and trying to make it available as soon as possible.

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