Thank you for your help Robert. cbRequestType has the values which are to be passed to the next cb, which I will hardcode and not pass from the feature layer.
So again, if I select E-WASTE from cbRequestType, I'd like cbEWASTE to populate with e-waste types such as copier, scanner, pc, etc. But if WHITE GOODS is selected from cbRequestType I would like my cbEWASTE to populate with white goods types, such as refrigerators, metals, etc.
cbRequestType populates from my feature layer, but based on the script, it would be easier to hard code the statement which links cbRequestType to cbEWASTE.
So I would like to pass a function which populates cbEWASTE on change of cbRequestType...I will have many other fields which follow the same format, so e-waste is just an example...