Excel 2003 on XP Pro

Every day I receive a text file with a single record (space delimited). I
have written a macro to load that record into the next row of the worksheet,
using Get External Data. All that is working fine, but in doing initial
testing and debugging of the macro, I noticed that every time I bring in a
new record, it creates a new external data range. I really don't need these
defined data ranges, I just need the values loaded in. Really just a
housekeeping issue ... several months from now, when I have 100+ rows of
data, do I really want to have 100+ different external data ranges defined?
Or am I obsessing about a non-issue? Is there some way to clean-up/delete
the range definitions without deleting the data (cell values) itself?