How do I insert a row into numbers, in just one column
From Numbers help:


  Move rows and columns within a table Select one or more rows or
  columns.
  
  Do any of the following:
  
  Move rows: After selecting the rows, click and hold the row numbers
  until the rows appear to rise off the table, then drag them above or
  below another row.
  
  Move columns: After selecting the columns, click and hold the column
  letters until the columns appear to rise off the table, then drag them
  to the right or left of another column.
  
  Tip: If you drag rows or columns outside of an existing table, you
  create a new table with them.


This has plagued me for ages and I took to forums to unsuccessfully find the answer, till I finally used the help function found in Numbers.