Moodle networking (MNet)

I've just realised where I've been going wrong! (duh)

Under Moodle Modules > Activties > Manage activties it is necessary to have the eye CLOSED on the Mahara assignment mnet module.

Then when you go to Add an activity to a course, under Assignments you see Mahara Portfolio as the bottom option.

I had been missing this as with the eye OPEN on the Manage Activities > Mahara assignment mnet module my attention on the Add an activity drop down list had immediately been drawn to the unwanted Mahara assignment mnet module option and I had missed seeing the Mahara portfolio option altogether.

Thanks very much to Dajan for inadvertently helping me realise my mistake.