Connect Supplier Line Items to a Client Project

Practical answer: Preserve a mixed supplier invoice while identifying the materials or services relevant to one project.

One supplier invoice may include materials for two jobs plus general business supplies. Splitting the source into invented invoices would break reconciliation, but recording only the total loses project context.

Keep the invoice whole and identify relevant lines

Retain supplier, invoice number, date, tax and total for the complete source. Apply project references at line or allocation level where supported and document any amount that cannot be assigned confidently.

Use product and job evidence together

Match item descriptions, quantities and delivery references with purchase orders or job notes. Do not rely on memory when similar materials are used across projects.

• Keep general overhead separate from project lines.
• Review returns and credits against the same project.
• Preserve the original invoice arithmetic.

Export project costs with a source path

A project report should show the selected lines or allocation and still lead back to the complete supplier document for audit and review.

Project allocation evidence

• The original supplier invoice remains complete.
• Project lines are supported by descriptions or job evidence.
• Unallocated amounts stay visible.
• Exports retain a reference to the source invoice.

Questions people ask in this situation

Should each project line become a new expense?

Not if that would misrepresent the source. Use line-level project context or a documented allocation while preserving one invoice.

What if one line serves several projects?

Record the allocation method transparently and leave professional accounting treatment to the appropriate workflow.

Where AI Expense fits

AI Expense keeps recognized line items and source files together, allowing project searches and exports without fabricating separate merchant documents.