Select your range (eg. A1:A40)
conditional Formatting
Cell Value Is equal to =$B$1

Format any color you like


"Mick B" wrote:

I want to place a series of numbers, say 1-40 on a spreadsheet. Once that
number has been selected in a separate column, I want the corresponding
number in the list to be highlighted in some way, or even deleted if that is
easier to do?

Am I explaining myself well enough?