If you use the base example file that in the Samples folder “Considering nonideal characteristics of EDFA_power.osd” you will get that functionality.
If you delete a component it will leave the inputs of other components at null and it will not calculate anything. This is why you get no signal at the output. Every component needs an input. For DWDM, you could start from one of our example files. For 100 channels though you will need a suitable sample rate and time window to capture the full spectrum.