Huntington Bancshares executives spoke Wednesday about several ways they are seeking to cut costs, including by consolidating three existing units into one and by offering a voluntary retirement plan to managers. Huntington Bancshares is reorganizing several major business lines under a new plan aimed at both cutting costs and increasing revenue, particularly by seizing opportunities in the wealth management business. Columbus, Ohio-based Huntington detailed the initiative Wednesday at an investor conference. Under the reorganization, the $182.9 billion-asset bank plans to consolidate three existing units — consumer and business banking, vehicle finance and a third segment that includes wealth management, private banking and insurance — into a single unit. That larger…