conditional formatting on formua with another cell

[Andy]

Dear All,
is it possible to do conditional formatting like:
format all cells in column A where the adjacent cell in Column B is empty?

Conditional formatting always refers only to one cell -> would need the same
functionality as if a formula is dragged down and the references are
automatically counting up

possible?
Br,
Andy

 

[Sean Timmons]

in cell A1 > Format > Conditional Formatting > Change drop-down to Formula is

=$B1=""

and select formats.

 

[Luke M]

Select all of column A, with A1 being active cell. CF formula is:
=$B1=""
Set formatting, ok, out.