there's a few special ways to negate in Chinese; 并不是 emphasizes a negation, often to clarify a misunderstanding; as in:
Writing isn't hard, but it's certainly not easy either.
写作不是很难,但是也并不容易。
I'm just tired is all; I'm not saying I *want* to go to bed!
我只是困而已;我并不是说想睡觉!
并 can also be used in a slightly more formal tone to mean 'and' between two verbs;
保存并退出
Save and Quit (in a computer program)
This sense of 并 means the same thing as 并且, so something like 'furthermore'
What do you want to say with 并得上? I dont really think its ever used like that.