How to merge the selected cells into one cell. It is good to merging cells when you need header for your table. Note you have Merge & Center, Merge Across, Merge Cells, and also Unmerge (The undo). Excel 2010 merge cells shortcut is to select the cells then type this sequence: Alt - H - M - M.
Step 1: Select cells to merge.
Step 2: Click Home tab then click the Merge & Center arrow then click Merge Cells.