Mass upload of data and adding custom fields

1st problem:
I have all the data I need for the directory on excel. Is there a way to mass upload these data so I won't have to create or add new listing for each? I have more or less 200 on my list and creating new listing for each would be too cumbersome.

2nd problem:
I tried adding custom fields to make adding new entries faster (i.e. URL, Google PR, Target Market....etc). I added via the built in custom press. However, every time I add a new custom field, the previously added one gets automatically deleted and I always end up with just 1 custom field. How can I add more custom fields?

Appreciate all the help you can extend. Thanks.