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I'm doubtful that P3 would allow differing data dates in each sub-project, once viewed as one master project. Have your Vendor try it and see if it's even feasible. Your vendor's position may be a self-correcting problem once he tries and fails to put differing data dates into one project.
Your data dates are really the date that your schedule is updated. My current contract ( for example ) requires schedule updates submitted on the 25th of each month. I imagine your vendor is going to be updating all of his sub-projects at the same time each billing cycle. Does this give you the contractual tool you need to insist on the same data date for each sub-project?
Each sub-project can have a different start date ( either as-builted, constrained, or otherwise) but the data date should always be the date of the update.