When printing I need to modify the size of text (increase the ratio eg 10x). The current text sizes in our DGN are too small.
To accomplish what you want, you need to write a design script. The online help has a section on desigh scripts. Open Help in MicroStation and select the Contents tab. Expand the book "Working with complete designs". Expand the folder Printing. Expand the folder "Print Resymbolization and Design Script". This entire folder can help you write the design script. An example follows:
if ((type == text) and (level == 18)) then size = 200endif
Print Resymbolization and Pen Tables