Can we use two different codes at the same time in CAESAR II V.5.0 for any calculation ? for example, consider a line being burried and then when it comes out, there is the code break between b 31.3 and b31.8, can we not split it and procede it considering a s a whole while telling caesar that to consider some of the portion as buried and use there b31.8 and consider the some portion of the line as above ground and to use there b31.3 ?