How do I stop new series from being automatically added to a chart?

When you add a new series to a document, it’s automatically included in your charts. To disable this, you have to do the following for one chart at a time:  

1. Click on an empty area in your chart (i.e. below the X axis). This opens the general chart properties under the Presentation properties tab.
2. Click “More” in the chart elements box.
3. Now, untick the option “Include new series automatically”.