How to create custom fields on a sco?(Let say Location or Region)

I have studied Adobe Connect 9 Web Services Manual. On page 22 says"

Custom fields are additional data fields that you define. You can define up to eight custom fields on a principal or SCO

using custom-field-update."

Q1:My question is would you please write me an example as how can I add Location as a custom feild to an SCO?

Q2: Is there any posibility to have this/these field(s) (Location,Region, Custum Field 3,....,Custom Feild8) added to CREATE COURSE and/or EVENT as an optional or mandatory fields? if there is, HOW?