Try this;
=Sum(Nz([QryProductQuoteDetail].[Form]![Cost]))+Sum(Nz([Replacement Details
Query1].[Form]![Cost]))

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>I have two subforms in access 2007 which Total fine on their own but
> when i try to get a Grand Total for both subforms it only calculates
[quoted text clipped - 5 lines]
> any ideas?
> joolie