There are 'Update Definition' and 'Refactor Definition' functions available in ReadyAPI! (SoapUI Pro), however ive just checked the Smartbear help and it indicates this functionality (which does what you need) isnt available in the freeware SoapUI.
So unless someone else has a spiffy way of doing the API updates i think you might have to it manually.
if this helped answer the post, could you please mark it as 'solved'? Also if you consider whether the title of your post is relevant? Perhaps if the post is solved, it might make sense to update the Subject header field of the post to something more descriptive? This will help people when searching for problems. Ta