Modelling a Böbbel

 From:  Lara (MALA)
10096.1 
Hi,
I must model a little higher point on a ring.
I trimmed the ring (with michaels help) with trimming tool. Before trimming I was able to lift the points and modify the surface.
But after trimming with two neighboured rings in order to avoid the whole ring changing I cannot pick the circles points.
I tried the diverse options for sweeping and for trimming...no success.
Do you got an idea where my mistake is?
Kind regards, Mala

EDITED: 10 Feb 2021 by MALA