Hi, please note, section 319 will come to application only after the commencement of inquiry or trial.
319. Power to proceed against other persons appearing to be guilty of offence
(1) Where, in the course of any inquiry into, or trial of, an offence, it appears from the evidence that any person not being the accused has committed any offence for which such person could be tried together with the accused, the Court may proceed against such person for the offence which he appears to have committed. |
Also, please take a note of section 216 of the CRpC. (Click below to read full section.)
You can thus move to the magistrate of your district and make a direct complaint to him about the facts you feel may have been left out in the chargesheet along with the proof/list of witnessess you may have pertaining to the matter. If the magistrate sees fit, he can alter/add to the chargesheet at any stage (as mentioned in the above section,) and so before the inquiry or trial begin.
Hope this helps!