Importing from a zone file is possible if you have a text based zone file in BIND format for your domain.
Example Zone File
$ORIGIN example.com. ; designates the start of this zone file in the namespace
$TTL 1h ; default expiration time of all resource records without their own TTL value
example.com. IN SOA ns.example.com. username.example.com. ( 2007120710 1d 2h 4w 1h )
example.com. IN NS ns
example.com. IN NS ns.somewhere.example.
example.com. IN MX 10 mail.example.com.
@ IN MX 20 mail2.example.com.
@ IN MX 50 mail3
example.com. IN A 192.0.2.1
IN AAAA 2001:db8:10::1
ns IN A 192.0.2.2
IN AAAA 2001:db8:10::2
www IN CNAME example.com.
wwwtest IN CNAME www
mail IN A 192.0.2.3
mail2 IN A 192.0.2.4
mail3 IN A 192.0.2.5
&mbsp;
Import Records
1. Select Managed DNS and select Domains.
2. Select the Domain Name you want to import.
3. Click on the Import Records button.
4. Select Zone File from the “Import Records from” drop down menu.
5. Paste a zone file into the text box. If the Replace existing records check box is enabled, all existing records in the domain will be removed. Click Import.