Sales Analysis Invoice Report Extension

Hello Experts,

I am required to generate a report which includes details

• Sales Invoice No
• Sales Person Name
• Invoice Amount 
• Gross Profit on that invoice
• Average stocking days for given invoice
• Collection days for given Invoice

I found that Sales Analysis by Invoice report has the basic data. Now I want to include stocking days and collection days.

I need to customize it and create Data Provider class and Tmp table. ( AX 2012 R1 CU7)

Please guide me how can I come close to the requirement.