This screen will setup which output pins that relates to each injector group. The table will be traversed backwards, according to the Injector Settings'screen.
For each table entry, choose which injector outputs you want to fire. In most installs, only 1 output is choosen for each table entry as that means 1 injector output is wired to 1 unique cylinder.
If you want to use injector outputs for other purposes than actual fuel injectors, then you must remember to assign those pins to unused injector groups.