2D to 3D - 2D Trim n Weld
build simple wall from 2D Shape with multiple splines, with Attach, Trim tool, n Weld (merge vertex).
2D to 3D 3DS Max video tutorial list :
Anim 2D Logo Text http://bit.ly/2nLKut9
Boolean n Mirror http://bit.ly/2ntSJbA
EditSpline n EditPoly http://bit.ly/2nxkLnf
2D Trim n Weld http://bit.ly/2oqtpI7
2D Attach n Trim http://bit.ly/2oqB9cW
Text to 3D Logo Sign http://bit.ly/2oqL8in