[quote user="Steven W"]We use CSV files to remap & update levels in design files. Since 2014 we have updated our levels (name, color, style, weight, plot/not, etc...). So the 100+ files have to be updated to comply with new standards.[/quote]
Does your Microstation Version already support the SAVE AS , remapping option?
You will find the remapping register when you click the SAVE AS OPTIONS
levels
colors
weight
text styles
IMHO it can be used by batch file converting, so you converting from DGN to DGN with a Excel/CSV remapping table.
You don't have to develop any code. It is built in function, IMHO since V8 2004