New enhancement to balance-sheet report

[Yogesh Agrawal]

Hi,
I would like to make an enhancement to balance-sheet report in the
commodities page.
I would like to include Basis Calculation method as we have in the advance
portfolio report,
also I would like to have an option to choose either price source or basis
calculation as
the the calculated value on the balance sheet. I have couple of question for
the same

1) Is there is any documentation for how to make local build and send
patches, if not
please can somebody guide me that how can I make a local build after making
the changes
and check if my code is working or not.
2) How do I send patch to be included in the next release.

Thanks,
Yogesh