JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
I’m sorry but I don’t fully understand your question.
Do you want to know which kind of fields you can use in a form to select quantities?
If so, you have several options like dropdowns, checkboxes or textboxes.
Please take a look at this guide: http://www.jotform.com/help/46-Quick-Overview-of-Form-Fields and see which field would fit better your needs and if you need further assistance please let us know.
We will be glad to help.