Customized Report similar to the Sales Tax Liability Report

[domainscanada]

Hi,

I need to have a report created similar to the Sales Tax Liability Report.

I'm not familiar with PHP and can't create the report myself, can somebody help in creating a modified version of the report?

I need the following:

-have a total at the bottom for the subtotal, tax, credit and total columns

-have the credit appear as a negative in the subtotal, tax, credit and total columns

-add a column for method of payment

Thank you.