Populating lookup table with VBA in Project 2010

I would like to auto populate a  field, e.g. Text10, with a set of values I will read in from an XML file.

Before I do that, I need to understand how to reference and manipulate that lookup table.

I've been reading up on this as much as possible from the web but failed to get anywhere, even the sample code on the MS website just bombs with a vague error on this line

Set objOutlineCode = ActiveProject.OutlineCodes.Add(pjCustomResourceOutlineCode9, "Location")

Please can someone provide me with the simplest possible steps for referencing and adding values to the table?