First Add field at at core table level i.e. FSC_PARTY_DIM, then define it in your prep datasets by changing prep source files (!AMLROOT/custom/source/prep_files). Add the field at header level. Then you can use it in your scenarios.
Good news: We've extended SAS Hackathon registration until Sept. 12, so you still have time to be part of our biggest event yet – our five-year anniversary!