Hi
Could you assist us with understanding what you are struggling with in specific? The requirement seems a little contrary to the way things would normally work (i.e. showing a filtered enquiry form). But the basic steps would be as below, please mention which items in specific you do not know how to accomplish:
1. Add a button to your form.
2. Override the clicked method.
3. in the Clicked method construct an X++ query using the Query and related classes including datasources for ProdTable and InventDim.
4. Add a queryRange to the InventDim table datasource created above, passing in your required value (possibly from the current selected record on your parent form.
5. Execute the query using a query run, extract the prodTable record from the query and inside your query loop and use info("") to display the details
Query reference
msdn.microsoft.com/.../aa638454.aspx;MSPPError=-2147217396