Attaching Trimmed Edges
 

I would really like to attach these surfaces and Maya says that Trimmed surfaces can't be attached, is there any other way around this or should I just parent the current objects unattached.

Here is a screen of the objects seperated. Don't know if it'll help :confused:

You cannot attached trimmed surfaces. From your screenshot, I wouldn't think you'd need to trim that surface to get the result you're going for.