Stop Line on graph from being continuous

[lizyeh11]

I have a table where the costs go up to march and i want to put it on another graph that has a table that goes on until december. When i put it on the y axis, the line goes all the way through to decmeber, how can i get it to stop at march (the green and orange lines)?

[lbendlin]

use a measure that returns BLANK() after March.