@piac can tell you for sure, but my guess is that the WB offset distance is at each vertex - that the vertex is moved 14cm along its normal direction.
If you want to move each face, and then remake the meshes, that gets harder. This is because offsetting each face an exact distance parallel to the face normal will result in corners that don’t line up. This means you’d need to then find the intersecting edges of each plane, and rebuild the mesh - and even then, there might be additional faces needed to get exactly what you want.
For example, the 4-face mesh shown in this image offsets to create a peak at the top that may not be what you have in mind. Offsetting a set of meshes with valence 5 (where 5 faces meet at a vertex) may result in an additional surface showing up at the tip.
I don’t think there’s a straightforward way to get what you’re after without modeling the offset by hand.