In your test you can save the value into a properties step, and use a groovy step to truncate the value you want using the split() method.
Im busy with work right now, but if someone doesnt beat me, i'll dig out the groovy to do this tonight.
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
@richie is right here. Though, one suggestion would be to do away with the property transfer, it's not required.
Personally, I'd stick a groovy step in between the two test calls. The Groovy step would be invoked by the second step. The groovy can read the value from the first call, manipulate and return the manipulated value directly into the payload of the second test call.