I used to use a CRM were we use Contacts and deals.

I first imported all contacts from old CRM to leads in Zoho. Then I imported the deals to contacts, and now I try to import the same deals to deals. I do this in 2 times, because I can't import the Fases in to the contacts. 

So when I try to import my deals to the deals of Zoho, there is no connection with the contacts. Can someone please tell me what I am doing wrong? 

Regards!