Dear Sir/Madam,
Please add Sales by Customer wise Report and Total Sales Reports to the Reports Area
What you ask is more complex than it may seem. Sales could be distributed through many income accounts, making it difficult to design a standard report that collects the information that might meet your particular needs. You may get what you want, however, in other ways.
For example, under Sales Invoices tab, search for a customer name and you will get a list of all invoices to that customer. The list can be exported to a spreadsheet so you can analyze it any way you wish.
Likewise, in the Summary display, click on the blue balance figure for an income account and you will get an exportable list. If you have multiple sales categories, these can all be exported to a spreadsheet for analysis.