How to Link a level to a Reference attachment.
It is possible (starting in build 08.01.01.09) to attach a Reference and then select a level to link the reference to. If the level is Frozen, the corresponding reference will turn off.This is available immediately in DWG workmode, it will be located near the bottom of the Settings Dialog when attaching the Reference.To have this available in DGN workmode, it has to be enabled in the workmode.cfg file(.../Bentley/Product/MicroStation/config/system)Add this line to the file:_USTN_CAPABILITY_DGN = +CAPABILITY_REFERENCE_ATTACHLEVEL