Typical Sage! Although I'm pretty sure job cost was originally written by a third party and later purchased by SOTA back in the day.
We have several clients on JC; not as many as we have on Work Order though. I'm hoping now that JC is rolled to framework, Sage will start adding features. I like to think they have been neglecting Job Cost because it was legacy (I know, I'm an eternal optimist!)
I looked for this enhancement request on the ""ideas"" site and did not find one so I created one. if anyone wants to vote for it, here is a link.
https://www5.v1ideas.com/TheSageGroupplc/Sage100ERP/Idea/Detail/38822