I'm trying to book a one way TPE-NRT-SFO NH1084 and NH8 respectively but having trouble displaying the fare on the ANA website. Found the fare on the ITA tool.

The only place I see that I can do the booking is on Expedia.com, however Expedia doesn't show me the booking fare code, so I'm a little hesitant to book from there. Additionally, I'm trying to upgrade with UA miles so I'm thinking to book directly with ANA to avoid any code/share or third party TA issues.

My questions are

1) is one way economy fare only bookable via over telephone? or is just ex-TPE one ways?
2) Anyone tried to upgrade B-fare to Busniess class before with UA miles? (though this question probably better for UA forum?)
3) is there anyway to check upgradeable space via the ANA Tool? is upgradeable space same as award space?

Thanks in advance