Embodiments of the present invention provide a method to quickly insert new rows or columns in a tabular data structure (such as a spreadsheet, or a table). The user expands a row height (or a column width). The expanded row (or column width) is automatically displayed with proposed divisions (for example, represented with dashed lines). The user indicates acceptance of the proposed divisions. The expanded row (or column) is automatically divided into multiple rows (or columns) as indicated by the proposed divisions.