With custom actions, you can to skip stages in a workflow job. For example, you can go from stage 1 to stage 3 or from stage 5 to stage 2.
Go to Settings > Workflow > Preset management.
Click the Job hyperlink and select the preset to which you want to add a custom action.
Go to the stage from which you want to skip to a previous or a next stage and select Use custom actions.
Select the stage the custom action will direct to, define the label that describes the action and pick the color of the button.
When you create one custom action, the normal Send to the next stage and Send to the previous stage buttons will disappear for that stage. Make sure you create the going forward and the going back buttons in Custom actions.