To Format Parts List Columns (AutoCAD Mechanical Toolset)

At the Command prompt, enter AMOPTIONS.
In the Options dialog box, select the AM:Standards tab.
In the Standard Elements list, double-click Parts List. The BOM Settings dialog box is displayed.
To set the column width, enter the width in the Parts List tab, in the Width column.
To set the heading row caption alignment, click in the Caption alignment column and select the alignment from the drop-down list.
To set the data row alignment, click in the Value alignment column and select the alignment from the drop-down list.
Click OK until all dialog boxes close.