_, By DICK KLEINER NEA Hollywood Correspondent HOLLYWOOD (NEA) Bea Benaderet’s death leaves Petticoat Junction in good hands, for June Lock hart is stepping into the long run CBS hit. She is playing a very sophisticated big-city doctor who moves in. “I guess I was the only person in Hollywood who hadn't known that Bea was sick,” June says. “I was about to leave for Hawaii , one day when Paul Henning (the producer) called me and said they wanted someone to step into the show and was I interested. “We met, he showed me some scripts and asked me if I thought I could play the part and I said, yes, I thought I could. That was all there was to it.” June has gotten her last three series that way—Lassie,Lost-In-Space and now this. Her agent simply takes over and conducts the salary negotiations. “‘Actually,’’ June says, “I approached this assignment with some trepidation, because it is an established show and Bea was so well liked by everyone. But it has been a joy, and everyone has made me feel at home.” . Hollywood is still one place where fortunes can be made by bright young people. Latest to qualify for the fortune derby are David Winters and Burt Rosen. Their six-month old firm, Winters/Rosen Productions, is in full boom. They got together permanently just last May. Winters was a well-established chore ographer and television director. Rosen was a producer and executive. “David,” Rosen says, “was the first person I ‘met whose ambition matched mine.” ‘“‘We want to own the whole street,’’ Winters says. “No,”’ Rosen says. “Not the street, the city.” They may do it yet. In their brief mutual career, they’ve created and sold three network television specials—two starring Ann-Margret and one youthful musical which will be called Spring Thing. _ They are working toward their first feature firm, with several deals cooking. They have established music publishin firms and a personal management firm. They’ve already outgrown their offices and, with typical reach-for-the-stars iced phy, they are now dickering for an entire building. “In six months,” Rosen says, “the only things we won't have in the entertainment industry will be record and movie distribution films. All the rest, we'll have.” Rosen is 32. Winters is 28.