Question on partial itin upgrades. T&C/FAQ seems clear about what happens if you waitlist the whole itin and only the domestic portion clears (you are only charged 20) or if you only initially request the over the pond (TATL/TPAC) section and it clears and then you have to pay more to add the domestic section.

Say at initial request, the TATL portion can clear (PZ>1 and you have W or higher fare class) but the domestic portion is PZ0. If I request upgrade for ALL segments (ie TATL clears) will the domestic portion be waitlisted? Ie, I would receive waitlist priority using Plus points (ie higher than regular CPU but lower than GS and 1K on YBM fares) and not be required to use any more points?

I think the answer is yes but want to confirm.