How to duplicate a summary table

I created a summary table based on a table with a lot of numeric columns. Hence I had to delete a lot of auto-generated columns. Now, I want a grand total for this summary table. The easiest option is to just duplicate this summary and delete the group by column to get the single aggregate number I want. Hence, I went into Raw Data view to duplicate the table, but it is disabled for summary tables. may I know why?

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Same issue for me - from my POV a better solution would be to add a grand total option to a summary table but I guess that is not a short term fix.