MS Excel
The Chart wizard term data categories refers to;

The data range that supply chart data
A chart plot area
A horizontal axis
The organization of individual values with a chart’s data series

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MS Excel
How do you insert a row?

All of the listed here
Select the row heading where you want to insert the new row and select Edit >Row from the menu
Select the row heading where you want to insert the new row and click the Insert Row button on the standard toolbar
Right-click the row heading where you want to insert the new row and select Insert from the shortcut menu

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MS Excel
If you need to remove only the formatting done in a range (numbers and formula typed there should not be removed), you must

Double click the Format Painter and then press Esc key in keyboard
From Edit menu choose Clear and then Formats
From Edit menu choose Delete
Click on Remove Formatting tool on Standard Toolbar

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