I'm not quite sure what it is you want to do with those verts, but its not cloning. Cloning is when you have some part of the model that you want to make a copy of, for instance if you modelled a button on a robot, and you wanted another one identical somewhere else on the robot, you would use clone to make a copy of the…
Not exactly sure what your looking for but heres my 2 cents. If you would like to be able to move those 2 verts and still have them connected to the original verts at the same time you can select an edge in subobject mode and shift+drag the edge and it will stay connected to the original verts. Something to note, this is…