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click the "activity spread usage spread sheet" button on top ,
u will get on window below instead of activity details window , on right side window , give right click and select "spread sheet fields" select and arrange the columns you need . especially cumulative planned resource, cumulative actual resource. using cum planned rsrce u can make graph, select the arranged fileds press cntrl+c and paste directly to excel sheet , then u can make graph there,.
Reports or Resource usage profile
you have two ways
using report or go resources usage profile