Form modeling Ⅰ
form > modify > soft modification
https://gyazo.com/2d7ec298ebf22d72a6738657e319a059
https://gyazo.com/16714013b0df25007ae9ed365ec36581
https://gyazo.com/71fd5f7b4c43697f9b8927e9df9361fb
select chain edge > Option(Alt) + Click > modify
https://gyazo.com/e7eb03911a00c59d88372a4625d3db36
select chain edge > Option(Alt) + command(Ctl) +Click > modify
https://gyazo.com/99e6bf6c0c18b6b8d9f9ddb77ffa3773