Explanation
This formula usesstructured referencesto refer to the “Amount” column in each table.
In addition, the formula will work even if the tables are located on different sheets in a workbook.
Note: the total row must be enabled.

If you disable a total row, the formula will return the #REF error.
These values can be numbers, cell references, ranges, arrays, and constants, in any combination.
SUM can handle up to 255 individual arguments.

Related videos
Introduction to structured references
Formulas to query a table

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