I think what you want to try here is the Column Expressions node, since it can handle conditionals, string manipulation, and math calculation all in the same node.
Here’s an example workflow to give you an idea:
Note that Column Expressions will require installing an additional extension, but you will be prompted to do this when you open the workflow.
But I don’t see how Column Expression is helping me with this problem since I have data in 2 tables.
Are you suggesting that I should move this data from table B and hard code it in this node?
As Igor suggested, I was assuming you would do some sort of Join beforehand. Example workflow attached - I did this without Column Expressions. I’m not adding a ton of columns since there’s a transpose first. So I think it should be relatively efficient…?