You can't put any queries in a report. You can make a reports from queries. If you want to make a subreport. Ex: Make Report1 and Report2...open Report1 in design view...drag Report2 in Report1...
we need some more info, how is the subReport related to the main report etc.
oh and by the way, if you just drag the query onto the main report the wizard will create the subReport for you, you don't need to create the subReport first