MS Excel
You can merge the main document with data source in Excel. In mail merge operation, Word is usually

Source
Server
None of these
Client

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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

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

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