problem with rounding - solid modeling

[MORENO100]

Bye to all,
I have a solid modeling problem, I try to explain it by attaching some pictures.
p.s.
I use I create 2.0 and I have no knowledge and much less the module to manage the thing with the surfaces.
Good day and thank you.

 

[JAMBO1970]

Hello Moorish,
If you want to make a fitting as an attached image, you don't need the surfaces.
as first operation execute the connecting command in sets mode, select the three edges and define a radius to please example 10.
with the open command click on the icon next to it and switches fashionable transitions, with the mouse pointer clicks at this point on the spherical connection created to the three edges.
turn on the drop-down menu next to the transitions button, scroll it and select angle ball, set the desired radius example 20 and the game is done.
you can also drag the 3 handles to adjust the shape to your needs.

 

[MORENO100]

legendary jambo1970!
It's the command I was hoping to find!
Thank you so much and good day!
Bye!