When creating interactive forms that have a flowable layout, many form authors prefer to start with an interactive form design that has a fixed layout. By starting in this manner, you can see the form in its final state. The form design provides the final layout including all the elements that users will need.
After completing the form design that has a fixed layout, you can then begin to divide the form design into its essential parts, identify what should become subforms, and specify how the subforms will flow the data being entered into the form.

Where to start