I am wondering if there is a better way to solve this case when making weldments. Example:

I am trying to connect one tube 80x40 with a "loop" of smaller 40x40 tubes. Firstly I create a 3D sketch where I fully define the whole part. Then I use this sketch for both "structural member" weldment features. 

I want the edge of 40x40 be aligned with the end of the 80x40

Because the weldment location goes