• I made a gravity form
• I have it posting to the post_type for topics
• I put in a hidden value with the label of “forum_id” and the number for that forum id as the default value for the hidden value
• I had an existing plugin that was mine. I added the code below to listen for Gravity Form events and then act on the submission.
• WordPress will do the submission, save the post, then go to this function to act and create linkage between the form submission and a forum.

// publish and associate the form

function sboxr_application_submission( $entry, $form ) {
	if (function_exists('bbp_update_forum')) {
	    //getting post
    	$post = get_post( $entry['post_id'] );

	    //changing post content
	    foreach ($form['fields'] as $key => $values) {
    		if ($values['label'] == 'forum_id') {
    			$post->post_parent = $values['defaultValue'];
    			break;
    		}   
	    }

		$forum_meta = array(
			'forum_id' => $post->post_parent,
			'topic_id' => $post->ID,		
			'comment_status' => 'open'
		);
		$post->comment_status = 'open';	
		$post->post_status = 'publish';

		bbp_update_forum(array('forum_id' => $post->post_parent));
	    //updating post
		wp_update_post($post);
	
		foreach ( $forum_meta as $meta_key => $meta_value ) {
			update_post_meta( $post->ID, '_bbp_' . $meta_key, $meta_value );
		}	
	}
}

// Hook to make the gravity form submission to connect to forum post creation
add_action( 'gform_after_submission_2', 'sboxr_application_submission', 10, 2 );

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