There is a naming convention that is followed in the Bar code label templates naming.
The first character "L" or "P" determines the template made for layouts or parts respectively.
The second character "G" or "T" determines whether template is with graphics or without graphics respectively.
The third character is an underscore "_". After this character you can give any name.
Please note that the template and the type of label to be made, match, i.e., If you want to make labels for layouts then you should select templates with name starting with character "L" and not with "P".