Populate new item form with info from page

Question

Is it possible to populate this new item form with information already filled in another form?

In this example, I have customized the default new item form to include a webpart to another list.

Screenshot

Many thanks.

EDIT: This is for SP 2010

Answer 1

Using JavaScript on the "Product Request" form you can change the "new item" link so that the resulting new item form is prefilled. See this question about prefilling fields in newform.

For filtering existing items list you could add a querystring filter webpart to the product request form and use the ID parameter to filter on a lookup column in the items list webpart