You can now easily move budgets that you have created in a Scenario to the Base scenario and your forecast will update accordingly.
You can also move budgets from the Base back into a Scenario
When you are in the Scenario simply click into the cell showing the budget that you would like to move (not the coloured line)
This will bring up a popup and you will see an arrow against the budget name.
Clicking this arrow will move the budget out of the Scenario and into the Base. Similarly you will be able to click into any base budget and move the budget into a scenario.