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Keyboard shortcuts in Office Add-ins - Microsoft Support
Office Add-ins can enable custom keyboard shortcuts you can use in Excel and Word to invoke add-in functionality. Each Office Add-in you install can change which shortcuts are available for you to use.
Sum a column or row of numbers in a table - Microsoft Support
To add up a column or row numbers in a table, use the Formula command. Click the table cell where you want your result. Click the Table Tools Layout tab and click Formula. Check between the parentheses to make sure Word includes the cells you want in the sum.