Do you know why cats scratch the same area over and over? It is their way of communicating and marking their territory. First of all, the scratch marks leave a visual clue that they have been in the area. Secondly, did you know that cats have scent glands in their paws? When they scratch they leave an odor that can be smelled by other cats. This is why your cat may be scratching a predominant object, like your table or sofa, in your house. He wants everyone to know that he is there and that area belongs to him. 
In order to save your prized possessions, you must get a scratching post so your cat can mark his spot in your house. If you cat has already damaged an area in your house, cover that area with thick plastic to encourage him to stay away from that area. The scratching post should be placed next to the covered area. Encourage your cat to use the scratching post by playing with the dangle toys on the post or using catnip to scent the post.
If you have a kitty or a cat who is new to your home immediately find two or three areas used the most by the cat. For example: near the sleeping place, near the resting place and the area where he likes to play. Encourage your cat to use the scratching post by playing with the dangle toys on the post or using catnip to scent the post.
You can purchase a simple scratching post or an elaborate scratching post or one in between. I suggest to have a couple different styles in your home. The Seagrass Cat Scratcher shown on this page is available in a case two. It allows both horizontal and vertical scratching surfaces. It measures 12″in diameter base and 19.5″ tall overall and includes a feather dangler. Made in the USA.
A scratching post is essential for any cat. Cats will always have an urge to scratch so you must provide an outlet to save your household items. More importantly, the scratching post is necessary for your cat to stretch and exercise, therefore vital to your cat’s good health.