Checked the TAP web site and the prior queries on this thread but confused as to definitive answer. My question is if I purchase a coach ticket through the TAP web site can I use points/mileage from my UAL account to upgrade to C. Plan to fly BOS-FCO with a change of planes in Lisbon.

If the answer is yes, what is mileage cost and how do I best do it. Looking for flight in Oct 2017 timeframe.

TIA
SAS