NBC News chief Andrew Lack — once accused of mishandling sexual harassment complaints at the Peacock Network — preyed on female underlings and pursued sexual relationships with them, according to one of his alleged victims. Lack’s alleged behavior is detailed in Ronan Farrow’s upcoming book, “Catch and Kill” — an excerpt of which was obtained Wednesday by The Post. In it, Jane Wallace, an anchor on CBS’s “West 57th” news show when Lack was an executive producer in the late 1980s, discussed her affair with the then-married news man. Lack, 72, a close friend of ousted “Today” show anchor Matt...