In my previous wiki (How to start with DELMIA Machining ?) I have used the intermediate Stock ... and find a nice example to illustrate the toolpath optimization linked to this functionnality

If you activate the intermediate stock in the PO you have the capability to display the input and output stock in the machining operation but the toolpath is by default optimized according the stock context .

Some time, it is not your expectation, you prefer to keep the control of the toolpath according your definition.

In this case you have to deactivate the input stock inside the MO