Reparent to two bone chains

[Hellyar]

Hello,
Sorry... just can't fathom this one out.
I'm trying to parent* two bone chains to a single, new bone.
I can use the Reparent Bone Tool to connect it to one chain, but I cannot figure out how to connect it to two chains. I've tried Shift and Alt, but without success.
Please could someone enlighten?
Thanks.

* Sorry, I don't know whether I'm using the jargon correctly. What I mean is that I want two bone chains connected to a single bone which is the boss bone.

[hayasidist]

with the bone layer active


select the head of the first bone chain you want to reparent
activate the parenting tool
click on the parent you want

alt-click on the head of the other bone chain (this selects that bone)
click on the parent you want

[Hellyar]

Perfect!
Thank you very much.
I was doing things the wrong way round.