Is there a way to use blocks stored in the Discipline Graphics library as a Reference Note Amenity?

What I'm trying to do (which I think I've done in the past) is to use Area Drain blocks that are stored in Discipline Graphics>Area Drains and add those as an amenity-type Ref Note. I'm unable to do so either through regular Ref Note creation by selecting Amenity>Generic or by placing an instance of the block from the Discipline Graphics library and then attempting to "edit object" to convert into a Ref Note.

I see that there are some area drains in the Plan Graphics library that I have access to, but this does not contain all the area drains that are in the Discipline Graphics>Civil location. I don't recall if the area drains in the Discipline Graphics were originally put there by me, or if those might have been part of Land F/X's block library organization at some point.

Do I need to move the Area Drain blocks in the Discipline Graphics library to the Plan Graphics library? If so, what is the best way to accomplish this?

Thanks for any help you can provide!