normal cut on cylindrical thin wall (NOT sheet metal)

Off the top of my hide - try this.

Assuming you used the scribe option of the wrap feature.

Use the face inside your wrapped ellipse profile to create a surface (using offset surface at 0.00). Then insert feature - cut - thicken with surface and this will create a normal cut.

Otherwise, as you mentioned, make your part as sheet metal and cut through with normal cut checked, although sometimes this will fail - at least it will warn you when it does.

thanks, that is the ticket.

I found and used a slightly different, (longer) way by offsetting surfaces on either side of the cyclidrical wall and built a lofted surface from the edges of those surface and made a surface cut with that surface. Your way is cleaner and I will change it to that.