I ran across a lot of questions about conditional redirects in the Troubleshooting forum when I was researching the topic, so I thought I'd post the solution I found success with.  The code below belongs on the myfunctions.php file and is specific to the Multi-page format.  

Basically, this code states that if field #5 ($$$5) in form id 8 ($cformsdata['id']==8)is answered "No" by the user (this field is setup as a radio button, but this would also work with a select box or check box group) and the 'Next' button is clicked, the user is taken to form id 10 (return 10). But if they answer "Yes" (or any other option besides "No"), they are taken to form 9 ($oldvalue=='9').

if ( $setting == "nextForm" ) {

if ( $cformsdata['id']==8 ){

$userfield = $cformsdata['data'][$cformsdata['data']['$$$5']];

if ( $oldvalue=='9' && stripos($userfield, 'No')!==false )

return 10;
else
return $oldvalue;

}

}
 
 

Hoping this helps someone else searching for this particular solution!