Perhaps you could describe what you are trying to accomplish in plain English--no data base jargon.
I feel I am unable to explain
There is an old saying--if you can't describe it, no one can build it.
If you were to task someone to build this database, what exactly would you tell them regarding the requirement?
Is this a typo?
ShadesID ShadesDesc 1538 CRNKL PPR CRNKL PPR
Your form names are confusing.
-tblSaleDetailsubform
-tblSale
Good luck.