Setup > Services > Select Service > Custom Fields
Setup Custom Fields for data that you may require for when a client signs up for one of your packages.
I.e Running a delivery type of service you may want clients to allocate which regions they are in, you can then create a custom drop down field with the options presented.
This way you can keep track of where the more prominent regions are etc and use this for planning by using a our Search Parameters. You can also deselect this from being presented on your signup form.
See also: