[Gmsh] About *Surface sets in Gmsh - Abaqus

[MA Ariza-Gracia]

Dear all,

from a STL surface I meshed a volume. I need to have one surface to 
apply a pressure boundary condition in a subsequent Abaqus analysis. The 
problem of keeping the surface and the volume is that elements and nodes 
are duplicated (even if I tried coherence / remove duplicate options).

Is there a way of defining a *Surface set (defined in abaqus by the 
facet of the elements on where to apply the BC). From what I've read, 
I'm not sure if this is possible.

Best,

MA