Every cell is editable. Click a cell, then drag the small green square at its bottom-right corner to fill down — or double-click that square to fill all the way to the last row, exactly like Excel. Press Esc to cancel an edit. A cell only turns orange when you actually change it; clear it to bring the formula back.
you enter
calculated
landing cost
overhead ≥ 10
typed by you (overrides formula)
Upper and lower target are both editable. Lower auto-fills as upper + spread; type your own to override, clear it to go back to auto. Drag a city heading left or right to reorder. Each mill has its own base cost box.
inside target