Columbia TriStar Intl. Television has joined forces with Britain’s Central Prods. Ltd. to create a new London-based joint venture, which will produce U.K. versions of Columbia’s sitcom formats.The first project from the new company is likely to be a British “Married … With Children.” The joint venture, as yet unnamed, will also develop original programming. Central has already taken over development of one project, “The Bambi,” from Columbia’s current U.S. slate, in hopes of producing the show simultaneously for both markets. The companies will be investing about $ 3 million in their new partnership, covering the production of 10 pilots over the next three years, and the cost of development exex. Columbia has international distribution rights to “The Upper Hand,” U.K.’s version of “Who’s the Boss” but overseas sales for any series produced by the new joint venture will be divided up on a case-by-case basis.