Copy Post From Main Blogsite

I want to be able to select a post from the posts in a specific category on my main blog/site and copy that post to the current blog/site.

I have been able to switch to the main blog, pull a list of the posts in the category, and show them in a dropdown or select box, using the code example from the get_posts function in the codex.

However, with the action set to ‘GET,’ the submit post loads the page rather than copying the post meta and content.

What can I do with the following code to load that data from setup_postdata() array and use it to update an existing post on the current blog/site?

<?php
  // THIS WORKS.  Reactivate switch to blog and restore current blog when
  // action is figured out that will copy post from main blog to current blog.
  // switch_to_blog(1)
?>
<form action="<? bloginfo('url'); ?>" method="get">
 <select name="page_id" id="page_id">
<?php
 global $post;
 $args = array( 'numberposts' => -1, 'category' => 9);
 $posts = get_posts($args);
 foreach( $posts as $post ) : setup_postdata($post); ?>
                <option value="<? echo $post->ID; ?>"><?php the_title(); ?></option>
<?php endforeach; ?>
 </select>
 <input type="submit" name="submit" value="select" />
 </form>
<?php
  // THIS WORKS.  Reactivate switch to blog and restore current blog when
  // action is figured out that will copy post from main blog to current blog.
  // restore_current_blog();
?>