Hi! I would like to add a new field to the Company General preferences. I know that a field can be added as a Parameter under a Script. So, what kind of script do I need to use?

You can do it on most script types (i.e. User Event, Map/Reduce, Client, etc). When you create a script record you can add Parameters - if set to “Company” preference, they will be displayed on Company General Preferences. Help article https://docs.oracle.com/en/cloud/saas/netsuite/ns-online-help/chapter_N2999459.html

Thanks for the information!