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The account types and the associated quotas and features are not transferable to sub accounts, sub accounts are basically free accounts whose users can are able to access forms shared to them by other accounts.
The sub account users can edit the forms shared to them by the owner of the main account but submissions to these shared form pass through the main account and are counted against the main account quota.
I hope this clarifies the situation involving your premium account, if you need further information please let us know