On Thursday, February 13, 2020 at 12:35:26 AM UTC-8, Jon wrote:
>
> is it possible to sum the values held in Field A wherever the field 
> exists, or do the individual tiddlers where it does appear, need to be 
> referenced?
>

Using filters, you can write:
<$list filter="[get[A]sum[]]" />

The get[A] operator retrieves a list of all values from all tiddlers that 
have a field named "A".
Then, the sum[] operator adds up all the retrieved values.

-e

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