reference from refworks and create bibliography from mendeley

I have a document with large number of references (200-300). I was using RefWork previously but then I found your Mendeley is useful and easier than RefWork. Now I have a problem in order to use Mendeley effectively. So far I have inserted all reference in my document using RefWorks and now onwards can I insert refrences from Mendeley in same document and afterwards can I create Bibliography using Mendeley? Because At the minute I tried using that but Mendeley can't retrive reference list in Bibliography from RefWorks. Can weachieve this? If not, does it mean I have to insert all references one by one into my document through Mendeley? Thanks for your time.