DGNIMPIMPORTVIEWINDEX system variable
Import view index
Specifies the number of dgn views to use level masks and dgn view settings. If the view number is "-1", then the view is not defined, and view settings and level masks are not used. Microstation uses the word "level" for layers; a "mask" hides content in areas or levels/layers.
-1 to 7
-1: View is not defined
1 to 7: Specifies level mask