This has got to be really simple, as I have been doing this throughout my coding years, but I can't make it happen using SF.



I have an Organization BO, a Group BO, and a GroupOrganization BO. An Organization can belong to many groups and a Group can have many organizations. I want to use the GroupOrganization BO to handle this. (The GroupOrganization table just has two fields -- GroupId, and OrganizationId which are foreign keys referencing the primary keys in the respective tables).



On the GroupOrganization BO, I just want to have a list control displaying all available Organizations, and one more list control displaying all available Groups. I want to be able to choose a Group, then choose (multiple) Organizations and click 'Save', resulting in proper records which look like (GroupId, OrganizationId) where both of these are composite primary keys.



I need some guidance how to go about achieving this through SF.



Thanks, and let me know if I can be more descriptive.