I have 3 C4000s with CATos and I need to replace them with 3 C4507R with IOS. I need the 3 new one to be set up just the same and I am have just been placed in this position without a whole lot of experiance with this equipment. I have been reading...

I am in need of some help here. I have just been put in a network admin position and I need to upgrade 3 new switches from C4000 to C4507R without taking the old ones off line. The old ones are running the older software while the new is running IO...