The most apt way is to serve him with a show cause notice for submitting fake bills, set up an enquiry team; file a chargesheet against him if found guilty; and take corrective/disciplinary action. If required you may suspend him while the team investigates the matter.
22nd November 2018 From India, Delhi
22nd November 2018 From India, Salem
As Mr. Umakanthan has suggested it is not mandatory to strictly follow disciplinary procedure in this case. However it is necessary that you follow Principles of Natural Justice.
1. Give the employee adequate opportunities to give his explanations
2. Conduct fair and just inquiry -through a neutral unbiased person
3. Arrive on a proportionate- quantum of punishment.
4. Communicate the employee about the findings of the inquiry and the punishment imposed.
Since this is integrity issue- you can allege and prove loss of confidence, which will be adequate for stringent punishment. However ensure to collect all relevant evidences and witnesses
Please also ensure to give notice pay in case you are terminating without notice, and complete full & final on the same day.
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22nd November 2018 From India, Mumbai