I want to cut a window opening in an exterior wall. I'm good with the header size. The concern is that there is a 2x6 cross member running from the top corner of the wall down to a stud at the middle of the of the wall. there is another one on the other side of the wall running down to the bottom the a stud, two over. The exterior of the studs are notched out so that the 2x6 is flush with the stud on the outside. I understand that this 2x6 is to add horizontal support to the structure---------- can i cut this to put in a window? I will put 1/2 plywood shearing on the inside of the wall as a subsitue to cutting the 2x6------- anyone out there know what i'm trying to do? and am I ok to do this??