I won’t be able to use the 1st leg because I need to arrive to my destination earlier and by trying to change my booking with TAP it shows no earlier availability with the same fare. Which is odd, as they could sell a higher fare instead (as there is availability for new bookings).

Online I am not able to request the cancellation of the 1st leg only. And if I do not fly it my 2nd leg will most probably be cancelled? (However I haven’t found this rule written anywhere, anyone?)

My question is whether anyone had experience with such situation and what could I possibly do to not lose my ticket entirely.

thanks!