This feature allow you to store your custom default values.
Let's say , for example, when you need a face turning operation , often you need to change the [Material to remove] to 4mm , the [Finish Allowance] to .1mm and activate the finishing operation.
You can insert this values, from main menu -> EDIT -> Set as default values .
The next time you are going to add a face turning operation, that values will be setted as default.
This also apply for setup and stock definition.
Is possible delete stored default setting , from main menu -> EDIT -> Reset default values