I am manually filing a 1040X to amend my 2016 return. My AGI is going up due to the amendment, so in Line 1 of the 1040X, I will put the net change in Col B, and the figure in Col C will reflect that net change to the originally reported figure.

Question #1: Since changing Line 1 causes changes further down the 1040X, should I populate Col B in all impacted lines all the way down, even if doing so is really just a repetition of the change in Line 1, Col B?

Question #2: For lines where there is no change being made to the originally reported figures (i.e. Col A and Col C match exactly), should I put a zero in Col B, or just leave it blank?

Thanks all!!