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BMW AG  aims to cut roughly 2 billion euros ($2.4 billion) from its annual purchasing bill by squeezing spending on transmission components and other parts to help finance the shift to electric cars. Amid plans to roll out at least 12 electric cars by 2025, Munich-based BMW is seeking to trim about 5 percent from costs for car parts alone, which currently totals about 40 billion euros yearly, Markus Duesmann, head of purchasing, said late Wednesday in an interview. That compares with a cumulative  4 billion-euro  reduction that competitor  Daimler AG is seeking in fixed costs, research and development spending and capital expenditures. BMW, Mercedes-Benz owner Daimler and  Volkswagen AG  are projecting that battery-powered vehicles could comprise more than a quarter of their sales by the middle of next decade. The German carmakers are pushing for cost reductions to offset weaker margins for electric cars, which Stuttgart-based Daimler estim...