A little knowledge is dangerous! - my conclusion after today's efforts!
After considerable, effort and help, I had successfully created a portal in my 'label bin' Layout with an ID field to link tables. Due to the number of records to choose from, I opted for a conditional value list (as used in another layout), again after some effort, I got it to work! However now my original conditional value list in the other layout has ceased to function - I am slowly loosing the will to live!
I would appreciate your help, please!
Below is the Relationship Graph, I have also attached the file for your inspection.