You can insert and delete rows in a sheet. This allows you to add or remove information as needed.
Select Row or Rows
Select the row or rows where you want to insert new rows. Click the row indicator (the row number) to select the rows. Drag across multiple row indicators to select multiple rows.
Select Insert, Rows from the menu. The new rows or rows are inserted into the sheet. The rows or rows that were selected are pushed down by the newly inserted row or rows.
Select a row or rows as shown in step 1. Select Edit, Delete Cells to delete the selection.