I don't believe there are any column precision settings. If you want to set
the number of decimal places displayed, select the column, then do
Format=>Cells, choose the number tab, then number, then specify the number
of decimals to display.
If you want the stored number to match what is displayed, go to
tools=>Options, Calculate tab and select precision as displayed - however
this is an application level setting and not applied to a single column.
