I don't have Audacity on this PC, but I think what I do is open the file, highlight part 1, choose Export as MP3 from the File menu, save as "Part 1", delete the selection, then Export the remainder as Part 2. There may be a more direct way to do it, though.

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David Coons
Member, Providence Presbyterian Church (PCA)
Lubbock, Texas
("Nebrexan": Born in Nebraska, born again in Texas)