Counting items (products) in Zoho?

Counting items (products) in Zoho?

Hi, hope someone out there can help with the following issue....

Our company is using the free version of Zoho. We receive many inquiries regarding our products and services, which we enter in the CRM as leads. Because our products/services can be divided along two lines - finished items and options for cooperation - we assign each lead one of two campaigns, A for people who are interested in the items we sell and B for those who want to work with us.

The issue we are having is the fact that we would like to keep track of how many of our items the leads in campaign A are interested in. So basically, if John Doe were to contact us and ask about the price of buying 7 of our products, we would like to enter this number in Zoho, either at the lead or campaign level - so that these numbers should add up. Put simply, If John wants 7 and Jane 3 items we would like to see in Zoho that our leads are in total interested in 10 of our items.

Is there any way of implementing such a counting mechanism on the free Zoho version?

Thank you
Ursa