How to compare data in the same table and assign a value

[yellow26]

Hi All! Good day. I'm new to PowerBI and would appreciate any insights on the below.

I have two tables with the following columns:

Actual

Order ID   

Quantity

Actual Cost

System

Order ID

Quantity

System Cost

The Order ID in the System table has duplicates (which I need to keep for comparison). I combined the two tables using UNION and added a column "Type" to distinguish between Actual vs System.

Consolidated

Order ID

Quantity

Cost

Type

Now, I want to compare the Quantity between Actual vs System. If the Quantity in System is equal to Quantity in Actual, the user should see the difference (System Cost - Actual Cost) in a new column. 

Thank you in advance!

[lbendlin]

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