How is the standard cost of a manufactured configured item calculated?

You have an item with two work definitions. One work definition is production priority 1 and named Plan A.
Another work definition is production priority 2 and named Plan B.
In your cost planning scenario, you have specified the work definition selection criteria as name and then production priority, and you have defined the name as Plan B.
How will the application select the work definition?

Which four steps need to be completed to establish standard costs for a make item?