[Zope] ZClass property sheets and lists of values

Is there a way to have 2 property sheets in a ZClass where one property in one sheet uses a property in another sheet to fill out its list? This way, I can manage who can control what is in the list. How do I refer to the property that contains the list? I tried things like

[Zope] Abstract ZClasses and containing classes

Scenario: here is a hierarchy of ZClasses. AbsDogPoundOrganization - abstract class ForProfitOrganization - subclass of AbsDogPoundOrganization NonProfitOrganization - subclass of AbsDogPoundOrganization Now I want AbsDogPoundOrganization to contain the class of Location (not an