Say if I have the following workflow - what is the best way to have a Save button visible at all stages which doesn't progress the workflow when press, until the Submit button is pressed?

For e.g if the Stage 3 approver presses Save, it shouldn't go to Stage 4.

Stage 1: submitter

Stage 2: approver

Stage 3: approver

Stage 4: approver

Stage 5: approver

Do I update a field each time the Save button and Submit buttons are pressed and get the workflow to check this field at every stage to determine if it should progress to the next?