If you want to update a record in your workflow process, all you need is the action “Update Record” inside your workflow.
After opening your workflow process inside the “Flow” module, to add the action “Update Record” inside the FLOW section:

Then the following screen will open:

For example, before the approval process ends, you want to update the status inside your ticket or Operation and set it as “Approved”.
In our example, we choose the model Operation in which we want to update the record (dragged and dropped from the right section inside the trigger variables).
In the Expression section we set the field “Status” equal to “Approved”.