In this articleWBDWarner Bros. Discovery CEO David Zaslav.Olivia Michael | CNBCA few months ago, after a lengthy and sobering review of Warner Bros. Discovery's business, Chief Executive David Zaslav gave his division heads a cutthroat mission.Pretend your units are family businesses, Zaslav said. Start from scratch and prioritize free cash flow, he added, according to people familiar with the matter. Then, Zaslav said, come back to me with a new strategic plan for your unit.Zaslav's directive has led to what will amount to thousands of layoffs at the company by the middle of this month, said the people, along with substantial strategic changes at CNN, the Warner Bros. film studio and other divisions.The CEO formed his plan after he took a hard look at the finances of the combined WarnerMedia-Discovery, a deal that closed in April. Zaslav determined the company was a mess. mismanaged WarnerMedia through neglect and profligate spending, he'd decided, according to people familiar with hi...