Well...you don't use FITEM for this type of selection. Since the lines all line up with the global cartesian directions you can use the TAN1 and TAN2 selection options instead. These are used to select lines based on the outward tangnet direction at the start and end of the lines respectively. As an example to select all the lines that align with the X global direction issue the following:
Does that give you the set of lines aligned with global X (sanity check).
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