Dor needs custom workflow code to copy line items from a 'parent' deal to its associated 'child' deals, but the current code isn't working correctly.

Nicholas suggests using the Line Items API to get items from the parent deal and the Associations API to find the child deals. Then, use the Line Items API (likely batch create) to add the items to the child deals. He also mentions GraphQL as a potential alternative for fetching data if available.