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I haven't found any documentation even hinting that this can be done but I thought I would ask just in case.
Hello Philip Alesio,
Its not possible to rename the sub project which has been created. The sub project once created cannot be dropped by normal user and could be done by DB admin but again it will take much time to drop.
So with my knowledge there is no way you could maintain or copy the history information of existing sub projects for the newer one.
Regards,
Sathish