Help Blending Surfaces

If anyone can spare some advice it would be much appreciated.

I am trying to make the edges of the surfaces flow into the central area, keeping the central area rounded like a pebble rather than concave as it is now. I just can’t figure out how to do it.

Many Thanks Guys.

Blending Surfaces.3dm (243.5 KB)

here’s a down and dirty go at it using the 4 surfaces you already had drawn… the resulting network surface still isn’t perfect but maybe it will serve the purpose you need it for…

regardless, the example is meant to illustrate that the 4 outer surfaces you have now are level up top… cutting them back as i did in the file gets rid of that flattop and lets the middle bubble up more

downNdirty.3dm (796.4 KB)

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Thanks Jeff,
your a handy guy to know.