While I'm sure this has been submitted as a suggestion before the Community page was launched by @Doug McLean and @Vince French (and others) I don't see it in the product feedback area for upvoting.
What about a new "Spreadsheet" panel that could be configured to receive input similar to the "Export to CSV" function with filters and sorting, but would include subtotals and totals as formulas. Give it the functionality of an old Lotus 123 spreadsheet at best, simple. After setup, it would have to be "Live" and update with additional markups. Could also replace Legends and live on the PDF.
Sounds like an interesting idea @Don Walke. Might be something similar to a quantity link - but be a table in the PDF…
I'd suggest adding your idea as it's own product improvement suggestion so we can "upvote" it. 😎
This would really help @David Cutler ! The other thing that needs adding is some sort of editing mode for the markup list - no need for double clicking on an item and the ability to set the order to tab through in.