How to copy and paste a model in the modeller

Hi,
I want to copy a process model and paste it in the same IS but i found that there was no option for that in the modeller 6.5

So i tried exporting the model and changed the name of the .model file and tried importing again but the modeller didnt accept this saying a process model similar is already existing.

So is there any other easier way to do the same.

Thanks.