Please forgive if this has been asked before - I cannot find anything on it. I'm flying TATL and have a paid economy ticket for which my GPUs have cleared into BF. Mrs. Northpole999 is joining with an award ticket in BF. We have a lap-infant under 1 year old.

If we wanted a ticket for the baby, can we tie it to either the Award BF tix or the GPU upgraded tix?

What would be the charge f it was through the paid Y ticket - 10% of the actual Y fare purchased? 10% of the BF fare?

Could it be added to the award tix as a lap baby (what price - 10% of the BF ticket?) or would a separate award ticket be required for the baby?

Thanks.