How to apply a saved chart template to an existing chart?

It is really not obvious!

You have to scroll down the chart type list (toolbar Charts/button Other) The saved templates are "hidden" at the very end of the list.

=>It is especially handy when you need to draw many of the same charts.

Yes, on the other side to save a chart as template you just need to: - Right click on the finished chart or - Select the menu Chart/Save as template...

Your saved templates are under Change Chart Type --> Other, you just have to scroll down below the radar charts. I know, not very intuitive....