Instead of state lawmakers approving property and sales tax hikes to fund maintenance projects at Washoe County schools, an amendment is being drafted that would authorize the local school board to enact the measures on its own, legislators said Monday.The Assembly Taxation Committee is scheduled to take up Assembly Bill 46 today. As written, the measure would require Washoe County commissioners to raise the county sales tax rate by a quarter percentage point and add a nickel to the property tax rate.But getting a tax bill through the Legislature requires a two-thirds majority in both the Assembly and Senate. Amending …