We wanted to know if we have to use another vehicle for the additional services or can we add funds to the definitized contract?
This response is based on the information provided. We suggest you discuss with your contracting officer and/or legal department as appropriate.
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The fundamental question is, "Are the additional services within the scope of the original contract?" Could the services your team needs to add have reasonably been contemplated by those who submitted or were considering submitting a proposal? If it is within scope you are allowed to add the requirement and the price to the existing contract. Preferably you would do this through a supplemental agreement and the contract remains fully definitized. If it is considered out of scope you would need to process and get approved an Justification an Approval (J&A) to be allowed to add the services to your existing contract.