This turned out to be a bit more complicated than I hoped.
The following works to copy only the !!! tags to the new column. You will then need to use a second pass to delete those items from tags (easiest with the tag manager) and remove the !!! from the tags in the new column with S&R.
The tags you want moved to the new column should be "marked" with !!!. This S&R does the job.
The search expression is
The next S&R will remove the !!! from the tags in the new column.
You can use the Tag Manager to remove the !!! tags from the Tags column.