How to make protrude like foot pressure mat

I would like to make some curve below protrude like foot pressure mat.
please let me know how to do it.

Hi -

It’s probably easiest to make those by pulling a bit on a SubDSphere.

use patch, you can create extra points to control the patch or you use a few offsetted inner forms which you lift up to shape it. turn history on beforehand to change the points to taste. if you need perpendicular tangents then create a base surface like here in red and use adjust tangency.