You can just send whatever you want from your inventory to the logistics trash slots(ctrl/shift + left click works), and it ends up in the network.
Oh, great! This is even better!
I didn't know that garbage cells would get into the network, I tried it - and it's cool, like magic! :)
I can't say much about the drawings, I'm still not used to using them, because I always try to do something new, and I don't want to do "copy and paste".