ABAQUS SET OF NODES BASED ON A MESHED PART AND CROSSHATCHED SURFACE.

Hi everyone, im trying to get a set of nodes from the region marked here as a surface. I d like to create a set of nodos, using all the nodes which are closed by the perimeter from this surface, without clicking node by node. any tip? (I need abaqus to detect a perimeter based on a crosshatched surface and the interior nodes that the surface delimits ). Thank u very much