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Modifying stock alone doesn't restrict tool path to its shape, when you select top of the stock at its highest point and set bottom height at model bottom or origin, tool path is generated covering everything in between those two levels and outlined stock, regardless of stock shape.
To restrict tool path to desired area, make sketch outlining it and use it as stock boundary along with tool on center and additional offset to cover desired area.
Make second sketch to be used as stock outline and adjust height tab to top of stock in that section of model.
You can also duplicate body and split it in sections then use parts in different setups to minimize air cutting in roughing.
I would do 3 radial segments, 120 degree apart and adjust bottom height so that tool path overlaps previous one, then finish using rotary.
Also note that using "rest machining" in initial roughing operation doesn't do anything, rest machining is used to foolow up after another tool or operation to remove stock that toot was unable to reach.
Fusion