Show list of 'Entry Keys' in a Dynamic Field

Hi There,

I wonder if anyone can help me on this one. I have a form (Form A) which has many entries. On another form (Form B) in a Dynamic Field, I need the user to see a drop down list of all 'Entry Keys' from Form A to allow the user to select the 'Entry Key' which will subsequently then retreieve specific field information in  From B. When I set-up a Dynamic Field in Form B and select Form A to reference, I cannot then see the 'Entry Key' as a field option to reference.

Would appreciate very much any advice on this - I am a beginner in Formidable Pro however, an advocate and a big fan 🙂

Thanks in Advance,

Nav