Select a cell.
From menu toolbar select Insert - Function - RAND().
(This will not work if you just type in the word 'RAND()', it must be
inserted with the 'Function' facility!)
Select that cell and several more cells down the same column.
Press <Ctrl> then <D> keys.
Bingo! It has filled down into all the selected cells.
Evertime you update a cell from now on, all the filled cells will refresh
their values.
Hope this is what you wanted to know.
Steve