Drag a widget unto the HUD

If anyone can remember UO (Ultimate Online) I have a spell book, with spells. I want to drag a spell widget(copy) from the book unto the HUD. So the user can click(Highlight the spell) and is ready to cast. The player can place dozen of spells all over the HUD. Instead of in the hotbar. They can remove the Widget spell now on the HUD by simply deleting it. or move it into another position.

I have looked at dozen of tutorials and all they have is dragging a widget around the HUD. IE: just moving it around.

Does anyone know how and example or know of a tutorial of this exact thing I wish to do.

Thanks in advance for all help.