To not always place a fence for printing, MicroStation nowadays offers the ability to to utilize sheet models to define your paper size. If practical, you could even redefine your design model to a sheet model (as the most simple way).
Alternatively, you may want to evaluate the method to have a specific element defining your border - that could be any closed element - even an irregular polygon or an ellipse.
Try the following:
If you like this you should create a "PrintStyle.dgnlib" in your projects .../dgnlib folder (or standards/dgnlib as company standard) with this definition. Then you have your printstyle(s) available in all your files. - With SS3 it will be possible to copy a printstyle in Print Organizer
Load a examples-Library and plotdriver for PDF und Windows: You only need to define an element with these in the right folders...