home improvement question

[mrbjv456]

I know many of you guys are contractors so i have a question. I have a engineering scheduled to come the end of the week but was curious now lol
so heres the basics I want to remove a header that drops 12 inches into the room and replace it with a flush header(hidden)
split level home
rear exterior wall to kitchen
previous home owner "bumped out" kitchen 8 ft so this exterior wall is now an interior wall. an attic on top of kitchen but not on addition.ceiling joist running perpendicular to this wall. under this wall is foundation wall of basement. 12ft span. My question is can i put a flush mount header? the roof joist also run perpendicular to this header any info would help