Percent of Series?

First, I don't think that's an overlay bar, because there's no option label totals in an overlay bar.

But if you were using an overlay bar, MichelleH is right that the best approach would be a BeastMode and a tooltip. It's an unusual percentage to get, but I think if you're using an overlay, I agree, it's what you want. Here's a BeastMode that gives the total for Blue and then Green/Blue for not Blue. Since we're mixing whole numbers and percents, I did the formatting in the BM, too:

Graphed as an overlay:

If green is a subset of blue, I think the overlay bar is the appropriate graph. The advantage of the overlay is that even without figuring out the percent that you want, the raw values will be correct, so hovering and tips will work out of the box.

The default calculation for percent_of_category isn't necessarily wrong, it just isn't what you want for your situation. There isn't a way to tell Domo that your series is hierarchical, so it's assuming you want to add up the different groups in your series to comprise the category.

When aggregating the values for green, you can't really directly access the values for blue, since they are held on different rows than the values for green. What you can do though, is used a fixed function to find the total for the category (blue+green) and then subtract out the green values. That's what my beastmode is doing above:

sum(`Value`) / — find the numerator (total of greens)

(

sum(`Value`) fixed(by `Category` ) — this is the same denominator as percent_of_category (blue+green)

-sum(`Value`) —subtract out the greens

) —a denominator of blues