A quick question about Invoking, Options

[Morgannah]

Well, maybe not so quick. ;) ANYway, I'm trying to get a few things sorted out here and I'm hoping that someone will be able to help me.

When summoning a great form spirit, as I understand it, one makes the initial test to bring the regular spirit and then another test to Invoke it. The part that's bothering me is whether additional dice from the previous test can be used here or not. The description seems to imply that this second test occurs as part of the initial summoning though it doesn't say anything about whether or not the dice allocated from before apply as they had initially or whether they've already been expended...am I making sense yet?

All I really need to know is whether the additional dice (from totem advantages and foci) need to be set aside for this second Conjuring test or not. Successes garnered from centering can be applied to this as well as the first summoning; would it apply to dice?

Thanks in advance for your help, :D
Morg

<edit: grammar is my friend>