There may be a neater way but this works. Somewhere in you sheet in a cell
type =min(A1:a4), I used L1 Change this to watever range you are trying to
evaluate.

Then select this range and click format  - conditional format - cell value -
is equal to
=($L$1) and apply your bold font.

The lowest value in the range will then become bold.

Mike

hey
Select each row and apply Conditional Formatting
cell value    - equal to - =min(1:1) for the first row and then bold
then the 2nd row
cell value    - equal to - =min(2:2) for the first row and then bold

Etc
etc
hope this helped

Select all the rows from row2 down (this ensures A2 is active)

Click Format > Conditional Formatting
Under Condition 1, set it as:
Formula is: =AND(ISNUMBER(A2),A2=MIN(2:2))
Click Format button > Font tab > Bold/red? > OK
Click OK at the main dialog