Thanks Chris.
Yes, it is 1-way only.
As the data exterally is not system critical I thought to simplify the administration internally of creating a DTS package that wrapped up the following:
1. truncated the external table
2. execute insert into....select
Obviously this limits the recovery options but do you see this as being a bad solution? The reason I've looked down this path is that only a subset of data will be extracted now and I need to do joins on tables.