I assume, since you are only modeling the disc that you want to look at the stresses and/or deflections in the disc itself. In that case, then I would apply the load to the hole, just as it is applied by your mating parts. I think you can use a bearing load. You may have to add a split line to split the cylindrical hole into a top half and a bottom half. (I'm not familar with how SolidWorks Simulation handles bearing loads.)
You might want to model the pin that goes in the hole and the shaft as well. Then apply your force to the pin and fix one or both ends of the shaft. The way the parts fit together may significantly affect the stresses and deflections.