Moving Files to folders based on First 4 digits of Name. If Folder doesn't exist DONT move file

I'm moving files to folders based on the 1st 4 digits of the folder name.

If the first 4 digits don't correspond to a folder name how do you just ignore the error and dont move the file? I'm thinking its in the OnError Event handler but again, there isnt much in the way of decent documentation on how to do this.

Any help would be appreciated

Debbie