Assuming ID numbers in Column A, and header in row 1. Create a helper column
in B
In B2: =COUNTIF($A$2:A2,A2)>1
AutoFilter all the TRUE, select all the filter rows, go to menu select Edit,
Delete Row, then delete the Helper column
> I have a list of ID numbers and I want to see the duplicates and delete all
> the other records.
>
> I have tried the Advanced Filter and it does not filter the list...
>
> I know that it can't be too difficult to filter out.