[GNC] How to managing budget in gnucash ?

[Long]

Hello guys, 
i'm not accounting, and do not have any experience about managing budget,
included using gnucash's budget.
Now, i'm following 50/30/20 budgeting rule, and i wanna create a budget by
that way.
But the problems here, I assume that i have 10.000, and 5000 (50%) for
"Needs" Budget, 3000 (30%) for "Wants" Budget.
But, GnuCash Budget Report always included Accounts you don't budget, but
it's have Transactions.

1 - if i put 8000 for EXPENSE, i will never know how am i spending on NEEDS
and WANTS.

2 - if i create a Budget with named "NEEDS" and create the other Budget with
named "WANTS" for EXPENSE. So i will always got overspending, like i said
above, When you running Budget Report for EXPENSE, GnuCash will include all
Accounts have transactions, That make Actual always higher than Budget.

So, i can't found the best way to make GnuCash Budget Report show the things
i want to see.

For more Clearly, i want to know what am i spending in "EXPENSE" for "NEEDS"
and compare it to Budget, i want to do that behavior for "WANTS" too.

Thank you for spending your time to help me and sorry for my bad english.
Regards.



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