I have the following set as the source template
Code:
{series}{series_index:0>2s| - | - }{title}
with "title" as the destination field.
However, if you don't want the series name as a prefix, omit it as well as the - that would be used as the series - index separator, e.g
Code:
{series_index:0>2s|| - }{title}
That will give you
for books that are part of a series, or just
for the rest.