Matrix visualization - to combine 2 datasets

Hello eveyrone 

I am really new to the power Power BI - so I would be very thankful if you can advice on what is the optimal way to combine 2 datasets in 1 matrix visualisation. 

So my datasets are 2 separate queries / excel files:

• Actual (which is a detailed extract of transaction which is aggregated by the cost types) and

• Budget(which is not detailed at all); 

I need to combine actual + planned values to acheive full year forecast 

Let say last ended month is March. In the matrix I need to show 3 months of Actual + 9 months, like this (the third table is the

desired oucome) 

I loaded my datasets, created all of the necessery connections, etc. the question for me now is how to create this visualisation