Using Creator to generate Estimates?

Using Creator to generate Estimates?

I'm wondering if anyone has a sample app or any bright ideas on how to use Zoho to generate itemized estimates. I can create forms with prices that go with services, e.g.:

ITEM PRICE
bread $2.50
milk $5.00
eggs $3.25

but, how do I create a single form where I can build an estimate? e.g.,:

ITEM QTY PRICE TOTAL
bread 1 $2.50 $2.50
eggs 4 $3.25 $12.75

TOTAL $15.25

In other words, dynamically add as many line items and select the quantity for each that I want. I can figure out total, etc.

I realize that Creator may not be the best for this, but I have all my customer and project data in Creator, so I'd like to generate simple estimates from here as well. I guess an invoicing app would be the same as well.

Many thanks to any who can help.