At this time, you can’t split cells in a table created in Google Docs unless they have been previously merged in Google Docs as well. To merge cells, just highlight the cells you wish to merge then do the following: 1. Click on Format in the top menu. 2. Hover over Table. 3. Click on Merge Cells. 4. Alternatively, you can right-click then choose Merge Cells from the popup menu. 5. To split merged cells, right-click or Ctrl + click on the merged cell then select Unmerge