Can we combine several production lots into one incoming inspection sample?

Only after the responsible quality authority approves what population the combined decision would cover. Sharing a truck, purchase order or pallet does not itself establish a common acceptance lot. Keep the original production identities visible while reviewing whether a combined plan is appropriate.

Establish whether the lots share a defined acceptance population

List the supplier's production lots and their quantities, part revisions, material references and relevant process histories. Then identify the acceptance-lot definition in the purchase inspection plan. Manufacturing lots and receiving lots may use different labels, so ask what each label means before assuming they can be merged.

Clarify the practical objective. Reducing repeated paperwork is different from reducing inspection coverage. It may be possible to use one report with separate lot sections while retaining independent decisions. The lot-traceability guide helps with the identity chain; the narrow question here is which stock one acceptance conclusion is permitted to cover.

Keep process, material and revision changes visible

Highlight differences rather than hiding them in an aggregate quantity. Look for drawing changes, separate material sources, changed production routes or earlier nonconformance records. These observations do not automatically forbid combination, but the reviewer needs them to assess the proposed population.

Ask how the selection would reach each part of the proposed combined stock. Avoid a method in which the most accessible production group supplies every inspected piece while the others inherit its result. Do not invent a weighting formula or sample count without the agreed plan and competent statistical review.

Also consider the consequence of an adverse result. If the combined population fails, can the affected stock be identified and contained? A convenient combined record becomes less useful if nobody can trace which original lots contributed the samples or which inventory lines must be held.

Ask the quality authority to approve the sampling scope instead of merging labels for convenience

Submit a concise proposal naming the original lots, the intended acceptance population, the selection approach and the decision authority. Obtain approval before using combined results for release. If approval is unavailable, retain the existing lot boundaries and inspect under the applicable instructions.

For the carbide blade delivery, preserve a mapping from the combined receipt to every original lot. Do not replace supplier marks with a new internal number that destroys that relationship. A combined report should state its scope clearly enough that a later complaint can be traced back to the relevant production records.

After disposition, record which quantities were released and whether any subgroups remain pending. Keep the decision limited to this documented population unless the procedure is formally revised for future orders. Receiving efficiency should come from an understandable plan, not from removing the information needed to investigate a later discrepancy.