Spread opportunity value over multiple months

In cases where an opportunity may be realised over multiple months, it would be good to be able to show that value spread out over x months.

Eg. If a $200k opportunity is likely to be won in October with sales spread over 3 months, it would be good to be able to allocate $50k to October, $50k to November and $100k to December for example.

This would give a more accurate reflection of pipeline value by month for forecasting purposes