To add a box layout to a preferred style to use on new charts. You will first want to create a box layout by right clicking on a box, go to properties format the box the way you would like and apply to the entire chart.
Preferred Style: Template
Once you have the box formatted click on a box and go to the design tab, click on style and select add to preferred style From there you can rename the style of box and it will be stored as a template for you to select for a new chart.
Preferred Style: Apply format
Once you import a new chart and would like to apply the box style to the chart you can import the data, go to the design tab and click on the preferred styles and select the box style, apply to the entire chart and click apply format
Preferred Style: Before
Preferred Style: After
