I am trying to produce a report on the basis of three queries. One produces customer details, one provides customer payments
and the other provides customer invoices. The report is to show on each page the specific customer details and a list of the
two different transactions. Each page will therefore be an individual account record. Should I be using 2 sub reports for the transactions and a main report for customer details and if so do i link them by Customer ID as this is the link between the queries?

Thanks for any help received in advance.

Yes, use subreports and link them to the main report on CustomerID.