Fourth time putting in an answer for this question. I have tried to put in the Discussion section, but it does not stay.
AS400 commands are made up of nouns and verbs.
Nouns: F= File, OBJ= Object, PGM=Program, etc
Verbs: WRK=Work, ALC=Allocate, DSP=Display, etc
Use the GO CMDxxx menu system. Replace xxx with any noun or verb.