Is it possible to add a custom field which is populated based on records on the database. For example, can we add a custom field that contains all Requester Names by referencing the table rather than manually adding them?

Secondly, is it possible to use $CS.getValue(FIELD_NAME) to change the value in the Requester Details - Name field? For example, we change get the value for the site field by using $CS.getValue("SITE"). How do we do this for the Requester Details - Name field, please?

Many thanks.