How to Merge Cells in a Table in Google Docs
Merge cells in a Table on Google Drive Document
You can combine cells together to create titles, add headers, or put information from several cells into one.
On your computer, open a document or presentation. Click and drag to highlight the cells you want to merge. Right-click and then click Merge cells. To unmerge cells, right-click the cell and then click Unmerge cells.