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Since there is no option to merge table cells in Google docs, creating a new table inside a cell could be a possible work around for this.
When I insert a table inside a table cell, blank lines are inserted before and after the table. How can I remove these blank lines? or create a layout similar to the one shown in the picture below (without the extra lines in first column)
I have tried playing around with cell padding and minimum row height in table properties but found no solution.
Here's a way to merge that works pretty well for all but the most complex tables.
Splitting a table would be a similar process:
Not as clean as a simple split/merge command, but should suffice in most cases.
I figured out the problem. Thanks @Dorje for your help, gave me a hint. :)
The problem was with the file's file extension, it ended with .xlxs, that was the name Microsoft Office 2011 gave it, so I thought it was correct.
I renamed the file with a .xlsx extension, and when I uploaded it again it was correctly encoded in the new language.
For anybody with this problem in the future, the problem is the file extension. :)
Best Answer
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