All good ERP systems give users the ability to create components and assemblies.  However, the methods and effectiveness of the methods can vary widely.

The most common methods for creating new assemblies are:

1. Manually Load Each Item - This method gives the most control for creating parts and assemblies in a system.  Users are able to configure each aspect of the components and assemblies.  However, this can be a time consuming process and is prone to human error.  Typically this works best for small assemblies.

2. Copy an Existing BoM - This allows users to save time by copying an existing BoM and changing only what is needed.  While this can save time over the completely manual process, it works only if the assemblies are similar and determining the similarity before the copy can be difficult.

3. 3rd Party/Custom Import Tools - Many ERP systems have 3rd party add-ons available.  Others allow users to create custom tools.  This can simplify the import process and save significant time.  However, 3rd party and custom tools must be updated to work with system changes and must be thoroughly tested to ensure they work as intended without creating other issues.

4. Native Import Tools - If an ERP system has a native import module, it probably has been verified to accurately import the information.  It too may save time and make the process easier.  However, it may be an additional expense and may not be as flexible as custom solutions.

Companies may decide to use a combination of the above methods depending on the complexity of the assembly and production requirements.