Which BOM type shows only the direct components of a parent item and not its subassemblies?

• A. Single-level bill of material
• B. Indented bill of materials
• C. Modular BOM
• D. Engineering bill of materials

Answer: (A)

Think about how BOMs differ in depth of detail. The key idea is how far down the assembly tree the listing goes.

A single-level bill of materials shows only the items that are directly required to build the parent item. It lists those direct components with their quantities and does not expand any subassemblies into their own parts. So you get a concise view of what goes into the parent at one level, without detailing the contents of any subassemblies.

In contrast, an indented BOM expands further levels, showing subassemblies and everything inside them. A modular BOM groups parts by modules rather than by individual components. An engineering BOM focuses on design data and may include relationships and specifications from the engineering model.

Therefore, when you need a view that includes only the direct components of the parent item and does not reveal the subassemblies’ internal parts, the single-level BOM is the best representation.