I'd like to move the management of contacts and the products they buy from my Excel spreadsheet into Zoho CRM.

I understand how to import contact records or product records from Excel or .csv into Zoho CRM.

What I don't know how to do is how I maintain the relationship between contacts and the products they have bought.

For example, Contact A has bought Product 1 in 2015 and Product 2 in 2016. I could do this easily for a few records but I have hundreds of contacts and many products.

Is there a way to import this relationship between contacts and products? 

I have unique ID's for each contact and each product.

thanks,

David