To Add an Entry to a Surface Texture Symbol Preset Value List (AutoCAD Mechanical Toolset)

At the Command prompt, enter AMOPTIONS.
In the Options dialog box, click the AM:Standards tab.
In the Standard Elements list, double-click the Surface Texture symbol.
In the Surface Texture Settings dialog box, click Edit List corresponding to the preset value list you want to edit.
In the Standard values drop-down list, select the type of value to add.
Select the entry to add to the preset value list and click Add.
Click the Move up or Move down buttons to move the new entry.
Click OK until all dialog boxes close.