Start with the evidence
Retain the complete source and identify the relevant lines before suggesting any split. Keep the original total visible so the reviewer can reconcile the parts with the document.
Work through the example
A receipt contains USD30 of workshop materials and USD20 of another item needing clarification. The two lines total USD50. The unclear USD20 portion should remain a question rather than being assigned a convenient purpose.
Make the next step clear
Ask the responsible reviewer how the parts should be handled. Save the explanation behind the split and avoid duplicating the full receipt amount in each destination record.
Keep the source context
These guides concern the evidence behind a business record. A receipt, a reimbursement request and a bank movement may describe related parts of one event, but they are not interchangeable documents. Keep each source and its role visible.