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To use other Number elements on the page as a source for a Number element
Number element, by itself, can use one table as a source. Still, if I have multiple Number elements using different tables as a source, it would be helpful to get the sum (or other summary types) of other elements, so there's a grand total of some sort.
The same idea as how Number elements work, but using other elements as a source rather than a table.
Those who use the Dashboard template on the Interface Designer.