I had someone create a sheet (shown below) and creating the "Months" in a separate column and sort of "child/parent" without having "January" tagged on each line.
From a functionality perspective, I would have rather had a column and choose the Month for each item, versus this "sort of" Child/Parent row.
Would this setup be ok? Testing, the filter wouldn't work if you were trying to Filter for "January" because it isn't tagged on all lines.
Thoughts?