What I am looking to create is a dataframe which looks like:

```
    amount  months      category    
0   6460    2018-01-31  budgeted    
1   7905    2018-01-31  actual  
2   11509   2018-02-28  budgeted    
3   21502   2018-02-28  actual 
...
...

```

The sample code I have and base datafrom I am working with is:

```
import pandas as pd
import string
import altair as alt

from random import randint

# 
# This is the general form of my 'real' dataframe. It is not subject to change.
#
months                  = [ 'Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec' ]
monthyAmounts           = [ "actual", "budgeted", "difference" ]

summary = []

summary.append( [ randint( -1000, 15000 ) for x in range( 0, len( months ) * len( monthyAmounts ) ) ] )
summary.append( [ randint( -1000, 15000 ) for x in range( 0, len( months ) * len( monthyAmounts ) ) ]  )
summary.append( [ randint( -1000, 15000 ) for x in range( 0, len( months ) * len( monthyAmounts ) ) ]  )

index   = pd.Index( [ 'Income', 'Expenses', 'Difference' ], name = 'type' )
columns = pd.MultiIndex.from_product( [months, monthyAmounts], names=['month', 'category'] )

summaryDF = pd.DataFrame( summary, index = index, columns = columns )

#
# From this point, I am trying to transform the summaryDF into something 
# I can use in a different context...
#

budgetMonths = pd.date_range( "January, 2018", periods = 12, freq = 'BM' )

idx = pd.IndexSlice
budgeted = summaryDF.loc[ 'Difference', idx[:, 'budgeted' ] ].cumsum()
actual   = summaryDF.loc[ 'Difference', idx[:, 'actual' ] ].cumsum()

budgeted.index = budgetMonths
actual.index = budgetMonths

budgetedDF = pd.DataFrame( { 'amount': budgeted, 'months': budgetMonths, 'category': 'budgeted' })
actualDF   = pd.DataFrame( { 'amount': actual, 'months': budgetMonths, 'category': 'actual' })

print( budgetedDF )
print( actualDF )

df3 = pd.merge( budgetedDF, actualDF, on = 'months' )
df3 

```

df3 looks like:

```
    amount_x    months      category_x  amount_y    category_y
0   6460        2018-01-31  budgeted    7905        actual
1   11509       2018-02-28  budgeted    21502       actual
...
...

```

I think I am close to getting what I want...just need the final merge step.