Please note, the line format option works ONLY for the 4th and 5th CSV column (descriptions and addresses). Most Garmin users use <BR> tags and semicolons.
Here is a simple test line:
-73.9625573,40.7786566,The Metropolitan Museum of Art,"5th Avenue; Manhattan; New York"
You can click here to see this test line in the GPX POI Editor, or click here to open your own POI file: Edit my POI File.
Go to Options and change your default proximity setting, delimiters and media alert files.