how to import supplier site that have import 2 communication methods?

I have supplier sites that have 2 communication methods - fax and emails.
It's important to keep both communication methods.
When updating a supplier site manually, we can add the 2 communication methods (email address and fax) but I couldn't import a supplier site that have the 2 methods.

Is there a way to import supplier sites when it has 2 communication methods?