Pass a value from form to query

We have a query that displays selected instances of object A. The view function displays the main form of object A.

We want to run a query against object B selecting those instances of object B that have the same attribute. Example A.Key = B.Key.

The question is how to pass A.Key to the query where all with A.Key = B.Key

Thanks for any help and Happy New Year!

Display the query for object B via a process. Then you can use the information from object A.

Cheers Rod