You can merge two or more cells in a table to create one larger cell. You might use this technique to create a title cell that spans across several columns, for example, or a large cell to contain a special note. You can merge cells across rows or down a column.
Select the cells you want to merge.
Click the Ribbon’s Layout tab.
Click Merge Cells.
Word merges the cells.
Tip
Resize It You can easily resize your table, rows, and columns by dragging a border. For example, to resize a row, drag the top or bottom of the row’s border. To resize a column, drag the left or right column border.
Tip
Splitting Tables You can also split a table into two tables using the Split Table command located directly below the Split Cells command on the Layout tab.