Edit Multiple Data Series Formats at Once in a Chart

My chart has multiple data series. Each series is a day of the month so a chart could many data series in it. The chart is a 3D column with 8 horizontal axis rows and many vertical axis columns.  Each vertical axis data series represents a day of the month. How do I format all those data series at once? For instance, I want to make all 25 columns representing days in the chart have a beveled top. Now I have to select day 1 column and edit the series, day 2 column edit data series, etc. How do I select all columns at once so I can make all columns have a beveled top?