Merging and Splitting Cells:
This must be done in Standard View.
Merging:
1. Select cells to combine by dragging across them or ctrl (PC) clicking the ones you want to merge.
2. Hit the Merge button
in the properties inspector
Splitting:
1. Select cell to split.
2. Hit the split button
3. A dialog box will appear. Choose to split the cell into rows or columns and specify how many.
4. Click o.k.