All custom GD-Post Types summed up?

Hi,

is it possible to sum up all GD custom post types in one subfolder in the URL (e.g. see below).

For example I would like to have separate custom post types for “hotel” and “restaurant”. And I would like to sum them up under “service”. So the URL should be:
“http://www.example.com/service/hotel/”
and
“http://www.example.com/service/restaurant/”

But at the moment every custom post type is at the first level:
“http://www.example.com/hotel/”
“http://www.example.com/restaurant/”

So how do I have to configure Geodirectory, to make this work?

Thx