Valid entities for attaching Balloons, Notes, Weld symbolds

Hi,

Does anyone know about all the valid entities to which I can attach annotations like weld symbol, balloons, notes, etc. in drawings or any link where I can see complete list. Common known entities are edges, faces, etc. but what other than that?

Question is I want to attach the notes, balloons, weld symbols to reference geometry like reference points, planes, etc. & I am not able to attach it to any one through API & manually as well, & I think it is possible because when I add auto-balloon in an assembly of blank parts, it creates balloons as per BOM

SolidworksApi macros