I had a certain comfy corner of the couch I always sat in. (twiniversity.com)
Whether your cat scratches the legs of a wooden table or the upholstered corner of the couch, a simple herbal spray deterrent like No - Scratch may be all you need to make the surface less appealing. (mnn.com)
It may also be effective to place a scratcher near or in front of a cat's preferred, yet undesirable, scratching object (e.g. corner of the couch). (glenerinanimalhospital.com)