Thanks Paul.
That link is still current, even though it is old.
Also linking to:
CA SDM: GRLoader - Everthing you need to know - Loading Configuration Item
And by-the-by, there is a new tool at the bottom of that page called SUPER GRLOADER which looks interesting.
It uses Web Services instead of GRloader and claims to be able to load in minutes what can take hours via GRloader. I haven't used it, but as I say . . . interesting!
Kyle_R.
UPDATE: The Super GRLoader tool also handles customised fields.