construction elements in NX sketch work bench

Hello all!
I recently started using NX cad after coming from a full Catia V5 background. one thing I'm struggling is with having construction elements in my sketches. where in we can make a part or an element of the sketch as a refence geometry and that does not reflect on the output sketch, but will be present when we edit the sketch.
can some one suggest me how to achieve this in NX