Yes. The Chargesheet could be altered or added by the Court before the pronouncement of the Judgment. The changes must be read and explained accordingly to the Accused. Section 216 of Cr.P.C. gives such powers to the Court. Should the changes in the Chargesheet were done after conduct of the Trial, the Court may either conduct a separate Trial for the added Charges or clubbed together with the current Trial in its discretion. Otherwise, under Section 217 of Cr.P.C. it can re-summon and take fresh examination in Chief and allow Cross Examination by the Accused of those Witnesses.