How do you split single column to multiple columns in Excel?

A cell can be in only one row. You can add additional lines within a cell, by pressing ALT+Enter to start another line within the cell. If two cells in two rows had already been merged into one cell, then they can be split by turning off the Merge and Center option. That can be done in the Format Cells dialog, which you can quickly get by pressing Ctrl - 1. A single cell cannot be split any further.