WQED Multimedia said today it has sold one of its creations that made it multi — the area’s biggest regional magazine, Pittsburgh magazine and its offspring City Guide, Home and Garden Magazine and Pittsburgh Weddings. The station will retain an eight-page “On Air” segment in the magazine, and it will still go to station members who donate $40 or more. WiesnerMedia, of Greenwood Village, Colo., is the buyer; it also publishes ColoradoBiz, Trucking Times and other titles, and plans to develop a regional media specialty. Terms of the deal were confidential. Publisher Betsy Benson will stay with the magazine. WQED began publishing the monthly in 1969 as an arts guide called QED Renaissance. Chicago’s WTTW and San Francisco’s KQED sold their similar monthlies years ago.