The simple QR Timer Editor can only build timer definitions with one step and only one group.
This editor is perfect if you want to quickly build a qrTimer.
The multi process QR Timer Editor can create timers with several process groups. Every process group can have several steps. A simple example is the yeast dough: let it grow for 60 minutes and then bake it for 30 minutes.
Using the process groups you can define a timer for different ways to archive the same result. For example group A could be pre-configured for a normal oven where group B could be for convection oven. When the user scans such a timer he will be asked to choose one group.
Of course you can use process groups for other things, like fitness training.