How to import Accounts including Contact information?

How to import Accounts including Contact information?

Hi,
Can someone help me with this import problem:
I want to import my accounts and related contacts from an Excel-file.
All info (like Account name, Billing street, Billing code, Contact, Contact's Street, Contact's phone, Contact's address, etc.) are in the rows of that spreadsheet.

If I try to import the Accounts I cannot map the contacts' info from the spreadsheet to the corresponding contact's fields in Zoho CRM.
And on the other hand, if I try to import the contacts' info I can only map the Account name field and cannot map the other Account info (such as Billing street, Billing code, etc.).

Am I missing something here?

Thanx for yr help!