Up-sells are different grades, different fabrics, different colors different styles of blinds or curtains. Cross-sells are other decorations that go along with them; for example, a beautiful valance or coordinating the curtain fabric with reupholstering a given chair in the room to draw the entire room together. These two functions, up-selling and cross-selling, are the vehicles you have available to your company or your profession to render substantially greater benefit and service to your client. And in the process greatly enrich yourself.