All Level Part Cost Calculation:
Calculates the cost of a part including the cost of all subassemblies and components recursively, based on their structure (multi-level BOM).

All Part Cost Calculation:
Calculates the cost of each individual part in the database (regardless of whether it's part of a BOM or not), but doesn't necessarily roll costs up the structure

Scenario 1: One manufactured part with a multilevel structure and routing

Example:

Top Part: A

Sub-assembly: B

Component: C

So: A > B > C

Each has routing, labor, overhead, etc.
 

All Level Part Cost Calculation:

Calculates the cost of A, and recursively adds cost of B and C.

Result: Final cost of A = Cost of A's routing + B's total cost + C's cost.
 

All Part Cost Calculation:

Calculates the cost of A, B, and C separately (based on default structure and routing).

But does not roll up the costs.
 

Scenario 2: Same part with only one default structure and routing (single level)

Assume:

Part A has no subcomponents or only flat components, and only one structure/routing.

All Level Part Cost Calculation:

Since there’s no sub-level or only one structure, it calculates based on that one structure.
 

All Part Cost Calculation:

Also uses the default structure/routing.