You may change the properties of the attribute to "YES" for Costing Relevant via Model > Attributes Management and then generate a new KB snapshot so that the fields will be taken into Mass Update & Pricing Simulation.
The detailed steps are as follows:-
1. Go to Model > Attributes Management
2. Search for the attribute to update
3. Toggle the Costing Relevant to "YES"
4. Save attribute
5. Go to Products
6. Search for "Assembly Process" (Specific Product)
7. Click on "Assembly Process" > Knowledge Base > [KB name] > Knowledge Base Snapshots > +
8. Update the KB version in Quotes
The field will be shown and this means that as an user you will be able to perform massive updates for the attributes of the same product in this view.
However if you are in the Configuration view, as an user you will need to go into the Configuration and update the attributes one by one.
For more information with regards to Price Simulation please refer to Price Simulation