Harold,
You should be able to handle this completely with an ITERATION within the xlate. Within the ITER loop, you CONCAT your NTE field in the output format with the current OBX:5 value into the NTE field on the output record (note the ~, which is applied when you select from your output record in the source pane):
CONCAT {~2(0).1(0).0(0).NTE(0).00098(0).[0]} {2(0).1(0).1(0).0(%g1).OBX.00573(0).[0]} –> 2(0).1(0).0(0).NTE(0).00098(0).[0]
(where the separator character for the CONCAT is a space)
Hope this helps.
Jim Cobane
Henry Ford Health