DAX measure with left outer join, multiple to multiple

[sodec]

I have one table in data model with one row per employee, their current end previous manager, and their current and previous output:

EmployeeID	Current Manager	Current Output	Previous Manager	Previous Output
1	A	10	B	5
2	A	20	A	15
3	B	30	A	40
4	B	5	B	10

In the reports view, I show the sum of current and previous output by current and previous manager respectively:

Current Manager	Current Output
A	30
B	35

And:

Previous Manager	Previous Output
A	55
B	15

I would like to left join the 'current output' table with the 'previous output' table on Current Manager = Previous Manager so I can calculate the output delta. What I want is this:

Current Manager	Current Output	Previous Output	Delta Output
A	30	55	-25
B	35	15	20

I have tried writing a measure to give the answer, but can't figure out how to pass the values of the delta:

Create Delta Table =

VAR x2=GENERATEALL(  

SUMMARIZE('EmployeeTable', EmployeeTable'[Current Manager],

            "Sum Current Output", CALCULATE (SUM('EmployeeTable'[Current Output])))  

,SUMMARIZE('EmployeeTable', 'EmployeeTable'[het_name],

            "Sum Previous Output", CALCULATE (SUM('EmployeeTable'[Previous Output])))

)  

RETURN

x2

[sodec]

This works well and is so much simpler than what I was trying to do. Thank you.

[johnt75 · Accepted solution]

You can create measures like

Current Output Measure = SUM( 'Table'[Current Output])

Previous Output Measure = 
	CALCULATE(
		SUM( 'Table'[Previous Output]),
		REMOVEFILTERS( 'Table'[Current Manager]),
		TREATAS( VALUES( 'Table'[Current Manager]), 'Table'[Previous Manager])
	)
	
Delta = [Current Output Measure] - [Previous Output Measure]