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
Widen the columns
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

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MS Excel
How do you delete a column?

Select the row heading you want to delete and select Edit>Delete from the menu
Right click the column heading you want to delete and select delete from the shortcut menu
Select the column heading you want to delete and select Insert Delete from the menu
Select the column heading you want to delete and select the Delete Row button on the standard toolbar

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