Adding a Second Y-Axis Your new series may not be measured with the same range of numbers as the old one. To make the chart look better, you can plot the new series on a differently scaled y-axis.

Repeat this step to add the other rescaled series (e.g., X2, X3) to the chart. The chart appears with three secondary axes, but the axes lack hash mark labels.

If you want to add labels to the bubbles in an Excel bubble chart, you have to do it after you create the chart. Mary Ann Richardson explains what you need to do to add a data label to each bubble.