SUE - Database links vs. graphic elements

Hi forum,

I'm using SUE to design the waterpipe, electric duct etc. In the program an excavation trench to a certain pipe is very easy to add, when I "extrude" 3D-elements of the pipe. However, I have trouble to separate the pipe elements to the trench elements, because when I'm deleting the pipe, the trench will automatically be deleted as well and my client insists these two different types of element have to be divided into different dgn-files. What is an easy way in SUE to create two files, one for pipes, wells etc. and the other one for trenches and other earth works?

Another question - maybe related to above is, when designing a 3D-model to a pipe / duct, SUE will automatically add a 2D line for it and this is very useful, when a plan-drawing needs to be prepared. However, the 2D-line SUE added seems to be some different kind of element (links) rather than "normal" microstation lines or chains. These line, depending on its horizontal / vertical geometry could contain different (often very short) segments. Thus it will look quite unpredictable, if legend for this line should be different than a full line (e.g. dash, dot line dot etc.). Is there a way to convert the line to a microstation "complex chain" or alike?

Thank you!

LiPeng