[Rails] can split form_for into two parts?

Rails 3.1.3

Is it possible to split form_for block into two parts?

More specifically, I want to create and save a model after filling
required fields.
But some of the fields are not required and unnecessary for the model.

<%= form_for(@foo) do |f| %>
f.field A
<% end %>

and form_tag updates the following select fields in form_for block with
JavaScript

<%= form_tag do %>
...
<% end %>

<%= form_for(@foo) do |f| %>
f.field B
<% end %>

Apparently if I hit the save button, it needs to save both field A and
B.

Thanks in advance.

soichi

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