Don't edit ever.bat file, simply paste ur folder (ex name: my_pmllib) in to the actual pmllib folder and come to respective module and pml rehash all and then call the pml u copied
otherwise u can segregate forms, functions, objects and paste directly in to the predefined folders for respective modules (\pmllib\design\forms, etc), only the problem is u cannot identify which is aveva supplied and customized pml in the folder.
i dont think this will have difficulty.
only thing is pml forms,funcs are listed in the pml index.
if u want use it for different user workstations, please share ur file path to access all