MS Power Point
To select all the boxes of an organization chart

All of the listed here
Click edit, select all
Right click the chart background click select all
Press and hold the shift key and click each box

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MS Power Point
What is Custom Shows in PowerPoint?

Use the only some parts of the monitor is called Custom Shows
Creating Presentations within a Presentation
There is no option of Custom Shows
The Presentation which can present only on particular date

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