Making report based on existing report instead of table/form??

Making report based on existing report instead of table/form??

Hi All,

I have two forms. Form 1 contains Product related details and form 2 contains stock related details.
I linked both the forms to get product-wise stock related details.
Now, if I want to link another new form to this report. How can I link it in Zoho creator?

Please help!!
Thanks! in Advance.