Changing multiple rates in P6

Hey there, 

We've a staff rate change coming up and I wondered if there were an easy way to add a new rate to multiple resources at once rather than go through our staff list of near on 2,000 people individually and adding the new rates to each one. 

I've thought of global change but that doesn't seem to have such an option. 

I'm slightly concerned I'm going to spend the next few months going through them all changing them one by one. 

Thanks in advance, 

Thom