Hello everyone!
I'm building a workflow where I'm reading in a file that contains numbers for store based on period.
Here's what the input looks like.

I would want to append a field that says what period it is and have the workflow select only the column with the corresponding period while maintaining the column with the store numbers.

Here's what I want the output to look like if it was period 3.

I was thinking I would be able to use dynamic select for this, but I can't figure out a way to achieve this outcome.