Welcome to the Forum Ashduco.

First, please edit your post #1 above, GO ADVANCED if necessary, and remove the (Please Help!) from the title. It seems like trivial thing, but it is against the forum rules (Link above to Forum Rules, recommended reading, lots of useful info in there), and the moderators do flag things like that.


Second, what you want is absolutely doable and pretty simple. If the "postal codes" are in a database with the codes on the left, and the Northing/Easting flag on the right, a simple VLOOKUP() formula will suffice. Read up on VLOOKUP and give it a try.

If you can't put your post codes on the left, then switch to an INDEX/MATCH approach. I'd use VLOOKUP for this.