D6 Is it possible to set node reference field and use this value in another field on the same node/add form? I have two node reference fields in a Content Type.
Driver
Manager

Each driver belongs to a certain organisational unit. Every organisational unit has a set of managers. I need the organisational unit to retrieve the right selection of managers in the node reference field Manager.

Now I need to select the driver, save the node and edit the node again. Then I can select the manager from the right set of managers (based on the organisational unit token I supply in the node reference field).

Is there any other way I can do this without implementing a 2-step form?
These two modules are intended for that purpose and have D6 versions.  I think Dependent Fields sounds closer to what you want, but Hierarchical Select Node Reference may work almost as well.

Dependent Fields


  The Dependent Fields module (formerly AHAH Dependent Fields) allows cck based fields to specify another field as a controller field, and react to its changes on the form using AHAH/AJAX without the form re-loading.


Hierarchical Select Node Reference


  This module allows the use of Hierarchical Select form element as a widget for CCK node reference field, both in node add/edit form and in views filter.