make a shoulder with surfaces

[Redro]

hello

happy new year

i need some support i try to make a shoulder in my piece but with surface and i dont how i do this

i attash fille and if somebody make this part with surface i am grateful

thanks

[BHOoi]

Hi, it's not clear to me what do you want to do/achieve. Could you please provide a sketch or something that helps to elaborate further? thanks