Update Units Directly from Spread View...
Users now have the capability to manually Edit spreads from the spreadsheet view.
The default View for the Spread is set to "Linear" that's uniform and system generated for Planning, Actual and Remaining Units. In typical real-world projects, Spreads may not follow a Predefined curve, instead are governed more on the basis of business targets/actual period by period consumption.
This is how you update the Spread manually for Scope Type Activity:
Flip the Curve Type drop-down value from Linear to Manual and begin editing the Spreadsheet.