Hi @fearguyq ,
The important thing here is to sculpt on a low level of the Multires, so as to not lose all the fine sculpted details. With those broad proportional changes it is easiest to make them on the Base Mesh. In principle, you could also sculpt on the Multires with the sculpt level set to 0, that would be the same as using Scuplt Base Mesh, with the difference, that with Sculpt Base Mesh, you can see the higher subdivided Mesh, while only affecting the Base Mesh.
