Game of Thrones: Declaring a March to various adjacent territories at the same time

Question

Consider the following scenario in Game of Thrones Board Game:

I am playing with the green pieces.

QUESTION 1. Can I march with two units onto area C first, apply the combat, and after that decide whether or not I will march with the third unit to B? In other words, can I wait for the combat result to decide what will I do with the rest of my units in A?

QUESTION 2. If it's the case that I can't wait for the combat result, and I must declare everything at once, can I wait for the combat result to decide whether or not I will put a power token on area A?

Motivation of the questions: if possible, for optimal strategy, I would like to attack the blue player first, and depending on the result, I would decide whether or not I want to march with the third unit to B. Also, I would like to be able to decide whether or not to spend a power token on area A after seeing the combat result, because if I lose the combat my pieces would retreat to A and a power token would be unneccssary.

Answer 1

Answer 1 "Before resolving combat, all other non-combat movement from the area assigned the March Order must be completed." GoT second edition rule book, page 15, 7th bullet point.

Answer 2 It is not the case. "If a playerleaves an area vacant before initiating combat , he must decide whether or not to establish control of the area before combat begins" GoT second edition rule book, page 24, 4th paragrqph of "establishing control of an area"