Adding a support/mantainance contract to a customer

Adding a support/mantainance contract to a customer

Hello,

I'm using Zoho CRM, and I want to add to a customer a maintanance yearly agreement, for a specific product he has.

e.g. customer x has product a and product b

I want to add a maintanance yearly agreement for product a. and another one (whose expiration date is different) for product b.

How this can be done ?

thanks,

Willy.