Assisting Blacksmithing

[Stars]

"Multiple characters that have the same Production Skills may pool their available Production Points in order to
create more difficult or costly items, but at least once person involved must possess the skill to create it."

So as long as john can make the thing for jim then jim can use all of his pp so john can make the thing for jim

So Yes jim and john can do the thing as long as one of them can create masterwork