Merge only selected edge of surface/convert inner quilt edge to outer

For reasons of convenience I would like to have a closed surface where one of the edges is open in Creo Parametric. A simple example could be a surface of revolution that is swept 360 degrees but has a open edge where the surfaces meet. Below is a artificially created image, where the sweep angle is close to but not exactly 360 degrees.

Revolved surface with open edge (but not quite closed)

So i am wondering is there:

1. A way to split a self enclosed surface at one and only one edge?
2. A way to merge only said edge and not all edges?
3. Convert inner edge to outer edge?

This would be handy at times.