Table Data Entry Form – Budget Input

I have searched and searched for a solution and cannot seem to find anything that works.

I need to create a budget entry form that looks/acts like a spreadsheet. I would like to break the form up so I can have a section for Income and a section for Expenses. I want to include a video overview at the beginning of each section and walk the user through the input. I need to have a column for the account type (ie. donations), and a column for each month with a total. I will probably tie this into a membership site so each department head can log in and enter their budget. I need the ability to export all submitted budgets into a spreadsheet. Make sense? Thanks for your help!