django compile form from URL parameters

This is my workflow:

1) view A : headers

2) view B : rows

3) form : one row with mixed data from 1 and 2

To compile form in 3) I need data that can be retrieved from 1): get the document, then in 2): reference of a specific row.

How can make the initial form values as what selected in 1) and 2) ?

1) pass the needed values as URL parameters?

2) invert the workflow: create a form and then call the views?

3) ?