Add a new item to a list

Hey guys,

As always, it's completely possible that the obvious way to do this is right in front of my face but I'm trying to find the best way to add a new item to a list.

For example, if I'm making a new material item on the fly and I want to save it to a "Template List" (not a Product List), I would've thought I could just copy and paste it or drag and drop it into that list, but I can't.

Am I missing something? Seems silly to have to rebuild the entire Item from scratch in order to be able to add it to the list.

Thanks!