Let's understand the design changes to the workflow and how they affect its “sleeping” process instances. 

Consider the following example of a process definition. In this example, some process variables and globals are initialized before a sub-workflow step runs. The workflow waits at the “task” step for a specified timeout, then completes. The plan is to make design changes and apply them to the instance in “sleeping” status. 

Generate and execute a new process instance. 

Click the “View Instance” hyperlink to open the process instance. The process instance is currently in “sleeping” status, as shown. 

On the process instance page, choose Actions > Reset > To Step from the menu. 

Select the appropriate step from the drop-down list, then click the Reset to Step button. 

The Reset Instance pop-up window appears for confirmation. You can click OK to proceed. 

On the Process Instance page, note that the process is now in RESET status. 

While the instance is in RESET status, return to the process definition and add a few steps to modify the design view, as shown below. Then, save the process definition. 

Go to the Process Instance tab, then select the Utils > Update > Design menu option. 

The Update Design pop-up window appears for confirmation. You can rerun the waiting steps by clicking the “All,” “Changed,” or “None” buttons. Selecting “All” re-executes all sleeping steps. Choosing “Changed” re-executes only the modified sleeping steps, while “None” skips re-executing them. 

The process instance design has been successfully updated. 

Navigate to Render Instance and observe the change in the instance design with the new steps, as shown below. 

To continue executing the process instance, go to the Process Instance page, select the process instance from the list, and click the 'Execute > Selected' menu option. 

The Execute Instance pop-up window appears for confirmation. You can click OK to proceed. 

The process instance execution resumes after the design changes are pushed to a sleeping process instance. 

On the process instance page, select the View > History menu option. 

The list of events is shown in the table, and the instance reset action is recorded as an event.