Progress update

Progress update

I created an app in Zoho to manage a real estate project. It has 1 form "Budgets", the fields are:

- Project
- Supplier
- Date

and it has a subform with:

* Task
* Quantity
* Amount

The idea is enter the "progress certified" each month for each supplier, so I want to create another form when I will select Project / Supplier and them each task with progress, for each selected task I will enter Progress Advance and calculate automatic amount.

I was reading all forum and reference guide, but I did not find the solution

Thanks
German