I am having trouble with a part. When I create a 3D sketch line on the midle point of part A, the line will always be drawns on the middle point of part B. The problem is the same when I try to dimension de part. If I take the dimension of member A, the cotation will be shifted over to member B. I attached some pictures to show what I am trying to explain and the file is attached as well for whoever want to try it and help me resolve this issue.
I managed to find the problem and fix it. I create a weldment and my main beam was split in 3 smaller beams. Those 3 smaller beams were created using the same long line. I edited the sketch and split the long line in 3 and now each beam has their own line. This solved my problem and hope it helps anyone else who will have the same problem in the future.