I've got a indesign document I've set up with a text box pasted within another text box but i now need to separate both elements onto different layers. If i try and move the text at the moment it gives me the warning 'Cannot move subselected items to a new layer. Ungroup the selection, or select entire group or graphic frame'.
Right. The application is not lying. You cannot move a nested frame to a layer without moving its containing frame at the same time. If you need them on different layers, you'll have to un-nest them. With the nested frame sub-selected, Cut. With nothing selected, Paste. Layer as desired.