How to Add Two Lines to a Powerpoint Chart. "Presenters are usually guilty of including too much data in their on-screen charts," says Garr Reynolds, author of Presentation Zen.

To add more data to the Y axis in a line chart, add additional numbers in cells below your existing data. Right-click the chart, choose "Select Data" and highlight all entries in the single column.

Wondering how to make a graph in Google Sheets? Open your spreadsheet and get your data ready. It’s time for a crash course on chart creation in Google Sheets.

You might add data labels or use pictures instead of a plain column in a column chart. One clever visual tool for highlighting a specific chart element or data point is to add a vertical bar.