Combining 3 pivotcharts in 1 graph - commonality is date

[ADAMSKI89]

Guys,

Please see image here: https://ibb.co/mcaYtH

Basically I am trying to plot the date an order goes through 3 different stages over time - ideally showing 3 lines on a date-quantity graph. The current method works, but I have a feeling that it could be much leaner! It is important that the data is cumulative as well!

Thanks in advance!
Adam