I am new to the creo. I am working on creo parametric 3.0. I am not able to rename the model name while saving the file.

While you once give the name and start the design there is no possible to change the file name .but there is an another idea save your file as "save as "comment there u can get change the name .use that file for assembly

Its very simple just follow the steps:
file> manage file>rename
tab will open where you can rename it either on disk or in session

My rename option is greyed out, does anyone know why ?