Question on creating item revenue reports

Hello everyone ,

I am new to nav and I have a hard time creating a sales report.

I am using the microsoft Nav 2009 R2 and I am needed to make a sales report in which I can present the total income of my items in a specific format in which I will show the items name the total earnings in a specific time  period and the earnings with and without the VAT .

My problem is that I dont know how to make this kind of report I have already made the items ,the sales  and the bank accounts but I dont know how to make the final report .

I have searched through the documentation of the Nav program but the instructions only led me to more confusion .

Any help is appreciated .