I have a client who has a quite detailed nominal ledger with about 35 income accounts representing their sales categories, with corresponding expense accounts.

I want to create an annual budget for them, which they can analyse on a month-by-month basis. From the articles and videos I've looked at, I think I would need to create a Budgetary Position for each income account for each month (35 x 12) as well as an Analytic Account for each expense account (another 35 x 12).  This seems like an extraordinary amount of work. Am I misunderstanding? I understand I need to define the periods for the budget but when my Budgetary Positions and Analytic Accounts will be direct one to one relationships with my revenue and expense accounts for each sales category, the extra layer of Budgetary Positions and Analytic accounts seems superfluous. In this case, it would be much easier if I could just create a monthly budget directly on each account. Is this possible?   

The outcome I'm seeking is to produce P&L budget v actual, as well as monthly chart reports such as sales per sales category actual v budget.  Thanks