I have a simple table in a Google Docs and now need to sum the whole column but can't find button like in Sheets:
Google-docs – How to calculate SUM in Google Docs
google docs
Related Solutions
As far as I know it's not possible to remove the line before and after the nested table. The good "news" are that now is possible to merge cells.
References
Add and edit tables - Docs editors Help
Merge cells and wrap text - Docs editors Help
At the top of Tools > Preferences:
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Best Answer
I have adjusted the focus of your question to emphasise the workaround you seemed to be asking for rather than the button that you also asked for since (a) one question at a time is generally for the best and (b) I doubt adding a SUM button to the menu bar in Docs is practical.
What I do find practical is the process I often use, for Word, that involves Excel even though Word has a lot of Quick Parts for actions of the kind you requested. That is to copy the table (without Total) into Sheets, apply the SUM button in Sheets and then copy the table (with Total) back into Docs.