Bill of Materials Column Properties
You can view, change, or insert the following BOM column properties:
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Custom Property
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Equation, you can use the equation editor to define column-based calculations on BOM cells
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Unit of Measure, for indicating units of measure for parts in a BOM
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Part Number
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Item No.
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Quantity, if your BOM does not already have a Qty. column
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Component Reference
To access the Column type and Property name lists:
Double-click the top of a BOM column, just above the column heading.
A dialog box appears above the column with the Column type and Property name lists.
To set a BOM column heading to a custom property:
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Select Custom Property from the Column Type list.
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Select a custom property from the Property Name list.
To set a BOM column heading to an equation that operates on BOM column cells:
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Select Equation from the Column Type list.
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Click Equation 
.
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Enter an equation.
To set a BOM column heading to Unit:
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Select Unit of Measure from the Column Type list.
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Select Unit of Measure from the Property Name list.
To set a BOM column heading to Part Number:
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Select Part Number from the Column Type list.
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Optionally check Use title summary to enter part numbers by summary name.
To set a BOM column heading to Item No.:
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Select Item No. from the Column Type list.
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Type the first item number in the Start field.
The item number increments by 1 unless you change the increment.
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Type the item number increment in the Increment field.
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Optionally select Follow assembly order 
to reorder items in a drawing to follow the assembly from which it is created.
The BOM automatically updates when you reorder items in an assembly. For components with multiple instances in the BOM, the first instance appears in the order in which it appears in the FeatureManager design tree. Subsequent instances increment the quantity.
When you select Follow assembly order, you cannot group, reorder, or sort items in the BOM.
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Optionally select Do not change numbers 
to retain original item numbers after reordering a row.
To set a BOM column heading to Qty. if your BOM does not already have a Quantity column:
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Select Quantity from the Column Type list.
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Select configurations from the Configurations list.
To set a BOM column heading to Component Reference:
In Column type, select Component Reference.