Long Relational Forms

I have created a relational database, and now am putting up forms on my website to collect the information (application). The problem is that I collect company information in one form, then I send them to another form where I hope to allow them to make as many contact entries for their company as necessary. I suppose the best way is to add a button at the bottom. So after the usual submit (which may be changed to submit final contact) and reset, there should a button that says add another contact. Which would then bring up a new contact form (indefinably until they feel they have entered all there company contacts).

So first of all, how do I make this button.

Second of all, is there a way following the submit button for the parent company information form that the "company" field form could be automatically filled in (and possibly not even shown as a form field) for all the subsequent contacts? (this is the relational field form).

I would really appreciate anyone's help who understands this as I don't know much about writing code!