Beginner question. ( Graphs and merging )

[HarrySim]

Hi all,
Just started with Power BI and I am trying to do something I believe is possible but I can't get it to work.
I am producing a line graph of orders over time, and a line graph of orders over time with the filter of orders which don't have materials booked to them.
I would like to blend these into one graph, like you can excel.
Is this possible?

 

[ParamRay]

Assuming a one-to-many relationship between Orders and Materials, you have two measures:

[Number of Orders] := COUNTROWS(Orders)

[Number of Orders without Materials] := COUNTROWS(FILTER(Orders, COUNTROWS(RELATEDTABLE(Materials)) = 0))

Then create a pivot table a column from Dates on rows, and both measures on values, and add a pivot chart.