Prescribing Displacements of particular nodes.

I am struggling prescribing a displacement in Simulation. I want to displace certain nodes on my part but it only allows you to displace a face in a certain direction. Basically the same way a normal simulation with an imposed force shows you which nodes displace and the distance. I want to reverse that. Please it will help out a lot with my project. I have had no success.

SolidworksSimulation