The Alternate Directory should be set to Y to indicate that the contact should be public. Otherwise the contact will default to being private.
If you have multiple contacts that need to be imported for each account, it would be simplest to separate the contacts into a separate spreadsheet and import them as an update. Use the column headings above for the information for the contacts, and then include either the Account ID column, or Update Only plus Email or Account Name column.
If using the Account ID column, the row value should indicate the account ID of the member account you want to add the contact to.
If using the Update Only column, each row value should be Y, and you will need to provide either the Email or Account Name column for us to match the appropriate member account. Note that if we find more than one matching email address or account name, the contact will not be imported as we would not know which account to properly add the contact to.
At this time it is not possible to update contacts using import.