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

Source
Client
Server
None of these

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MS Excel
To center worksheet titles across a range of cells, you must

Select the cells containing the title text plus the range over which the title text is to be enfettered
Select the cells containing the title text plus the range over which the title text is to be centered
Format the cells with the comma style
Widen the columns

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