easy manipulation of bibtex styles?

[Harold Mouras]

Dear Lys users,
would there be a simple way or tool to manipulate bst style files to easily
get the style of a journal that not pertains to the style files database
generally available ?
Is the only way to edit the bst style as text file and to find where the
changes have to be made, or is there any "interpreter" software for bibtex
styles?
Thanks for your help,
Sincerely,
Harold