Bordeaux to Bilbao

Looking to book two train tickets from Bordeaux to Bilbao in August 2012. I couldn't get the system to route me directly. I found the TGV train to Hendaye (on the border).

So is the idea that I book two train tickets? One fromBordeaux to Hendaye and then a separate one from Hendaye to Bilbao?

How soon in advance can I book? 90 days or six months? Thanks.
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