Hours after sister network CBS closed the books on its upfront sales, the CW has followed suit. Coming off a smaller base, the CW posted bigger percentage increases than CBS, with both the total haul and CPMs said to be up low double digits from last year. With volume increase believed to be in the 12%-14% range, the CW pre-sold about 80% of its ad inventory, on par with last year, for as much as $500 million, sources said.