What form does the data take that you are importing into this repeating field? Unless it is itself a repeating field, This can't simply be imported, you'll need to import into an intermediary file and use a script to move the data from the intermediary file into the repetitions in your field.
I was experimenting with using a .csv input file with only 2 fields like so;
Hey You,Pink Floyd
Another Brick In The Wall,Pink Floyd
Tracks1 is a repeating field in my FMP db and I want each song title to go into it.
Same for Tracks2 where I would like the artist to go.
It will be much simpler to import the data into a table of two fields, Title, Band (or whatever names you like)
and then link to this table by the band field instead of using a repeating field. A "Pink Floyd" record in your main table could then use a portal or a calculation field to list all titles by Pink Floyd.
But if you must put them in a repeating field (I can't recommend that approach, a related table is much, much more flexible), A script can loop through such records and populate repetitions of the repeating field from the data in this table.
Thanks for the info. I'll give it a try.