can I make a selected area conform to a shape?

in other words I’m trying to make the selected points in this screenshot become round so they fit in the circular end of the other shape.

You could try shrinkwrap modifier with a vertex group.
Put selected vertices to a group (ctrl+G), add SW modifier, tell it which target and vertex group to use and try different modes.

In this particular case it could be useful the ‘To Sphere’ transformation, to round that selection.


thanks both of you, Paolo your suggestion took me a moment to figure out where and how it worked but that’s exactly what I needed thanks!