Sure, here's a basic example:
[TABLE="class: grid, width: 500"]
<tbody>[TR]
[TD]Date
[/TD]
[TD]Product
[/TD]
[TD]Qty
[/TD]
[/TR]
[TR]
[TD]4/15/2019
[/TD]
[TD]apple
[/TD]
[TD]1
[/TD]
[/TR]
[TR]
[TD]4/15/2019
[/TD]
[TD]orange
[/TD]
[TD]5
[/TD]
[/TR]
[TR]
[TD]4/15/2019
[/TD]
[TD]grape
[/TD]
[TD]2
[/TD]
[/TR]
[TR]
[TD]4/15/2019
[/TD]
[TD]mango
[/TD]
[TD]2
[/TD]
[/TR]
[TR]
[TD]4/15/2019
[/TD]
[TD]banana
[/TD]
[TD]7
[/TD]
[/TR]
[TR]
[TD]2/17/2019
[/TD]
[TD]apple
[/TD]
[TD]1
[/TD]
[/TR]
[TR]
[TD]2/17/2019
[/TD]
[TD]orange
[/TD]
[TD]1
[/TD]
[/TR]
[TR]
[TD]2/17/2019
[/TD]
[TD]grape
[/TD]
[TD]9
[/TD]
[/TR]
[TR]
[TD]2/17/2019
[/TD]
[TD]mango
[/TD]
[TD]8
[/TD]
[/TR]
[TR]
[TD]2/17/2019
[/TD]
[TD]banana
[/TD]
[TD]2
[/TD]
[/TR]
</tbody>[/TABLE]
So we have 10 rows. The sum total comes to 38.
Using the formula I initially provided, it will yield a number of 10 rows. If I filter on just 4/15/2019, that formula will yield 5 rows. All is good to this point.
My goal is to have the sum total change along with the filter. So in this example above, it should show 17.