We'd like to be able to sum a column in a pivot table either as part of the pivot setup, or utilizing a script.
Thank you for submitting this request. With Infoplus User Reports you are able to create a Pivot Report that can sum any field from the table the SmartFilter is created on. Here is our Knowledge Base Article relating to pivot reports in Infoplus. I hope helps accomplish what you were looking to do!
It looks like the images in the article you linked to aren't displaying, just wanted to make you aware.