Importing Webform Submission List (Text) with Feeds Tamper
I managed to find a solution on thejibe.

The Feeds Tamper setting I was looking for was "Rewrite".



In the last field, I added "Rewrite" and added tokens for each of the values separated by commas.



Following that, I added Explode.

I did a test import and had great success.

I hope this helps someone.