Linking Parent & Child Datasets

Question

I had hoped to create a report with a Listbox grouped on the Parent Dataset - then text boxes at Parent Dataset level and a table at the Child Dataset level.    I cannot link the table with the Child Dataset correctly.  I have tried the Filter facility and the filtering does not synchronise with the List Box or Text boxes at the parent level.

The only way I have found to do this is a Sub Report with a query parameter.   Can this be done with  table or is that not possible???

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PG