Yes I had already used the poly combine tool so both the head and ear were now combined.
I could make out that the edges I was being allowed to select were slightly bolder than the edges I was not being allowed to choose.
I would have thought that any edge which delineated the end of an object would be a border edge but it appears not.

Thanks for your other suggestions though they could be helpful especially if I can figure out how to use the poly append tool.

Any feedback from you Carl as regards the way you got the back of your ear to extrude out toward where it is going to merge and how your edges all seemed to be selectable borders please.

Because if I make an ear using Mikes tutorial then I extrude some of the inner faces on the back of the ear ready for merging, my new edges are not border edges and are not selectable.

Femina