The term 'procedure portion' refers to the STEP in a process or procedure. It is the part of the process that requires the most attention and detail, as it is the part that will determine the success or failure of the entire process. The four-letter word associated with this term is 'STEP'. This word implies that the procedure portion is the STEP that must be taken in order to complete the process. It is the action that must be taken in order to achieve the desired outcome.