Cumulative total

I have 2 tables

1. Target Table, 2. Achieved Table -  shown below
I linked both tables by Month columns and want to visualize cumulative totals.
X-axis I need to keep the month number from the Target table
Y axis I need to keep the cumulative total both from the Target table & Achieved table

I tried to create a visual as shown below, but from the achieved table, I need data till last month but it is showing me data till the end.

Pls suggest any way to do the same