Thanks Guy, I am new with AppSheet. I only tried to do that task for my own. I know is a long trip but I made what I wanted to do. Again Thank you very much.

Yeah, you right… Works the same for me, but this is much easier and efficient, Thank you. [Units] SUM(Orders[Units])

I will do this steps: In Product table add one column named CategoryID In Category Table on column name CategoryID In Product table in this new CategoryID column set EnumList type value and in its setting open Type Detail and Base Type: Ref and Base ...

You right. It was my bad. But neither Works. I am checking the documentation you sent me. Thank you.

Steve, you are doing a great job with this AppSheet tool. Congratulation. I only have one week using this tool and I am very impressed. I am a full stack developer I burn my brain and I spend a lot of time coding to do something no so cool like this ...