To allow Advance Steel to keep the part mark of an object during copy/paste from one drawing file to another you need to check the default "Copy the object park mark" from GAM / Defaults / System / General category. When you copy/paste a file, you do not make use of the numbering with standard part template. Advance Steel will use the existing part mark from the copied part during the identical part detection if the numibering methods do not affect them.
To number the model with the standard part template method, you need to store the drawing file that contains the standard part in the following folder : C:\ProgramData\Graitec\Advance Steel\2013\Shared\StandardPartTemplate, and then check the respective dwg file in the Numbering dialog / Standard part template tab (With the file in that path, it will automatically appear in the respective list).