SharePoint (and Project Server) Shenanigans

If you want to have the ability to add new values from new form item you have two options. (that I know of) First you could use $().SPServices.SPLookupAddNew. Or, you could use the technique I have demonstrated in the video below.

Related videos:

How do I: Set the ID attribute of a table row using jQuery

How do I: Implement $().SPServices.SPCascadeDropdowns