BOM Materials 
Materials are specific parts of the products to be assembled. Each material becomes a line item in the BOM. You can also add another BOM to the BOM. Materials to add to BOMs are created in Administration. You can also import and export BOMs and materials as CSV files in the Administration module.
On the Materials tab, you can:
Add and edit a bill of materials
Add and edit a material
Reorder BOMs and materials
BOMs are hierarchical and can contain other BOMs as line items.
To add a BOM:
On the Materials tab, choose Add Bill of Materials.
Select one or more bills of materials and choose OK.
Save your changes.
On the Materials tab, choose Edit for the bill of materials to edit. In the dialog box, make any changes required.
Choose OK.
Save your changes.
Materials are specific parts of the products to be assembled. Each material becomes a line item in the BOM. Materials to add to BOMs are created in Administration. You can also import and export BOMs and materials as CSV files in the Administration module.
To add a material:
On the Materials tab, choose Add Material.
Select one or more materials and choose OK.
Save your changes.
On the Materials tab, choose Edit for the material to edit.
In the dialog box, make your required changes.
Choose OK.
Save your changes.