Linestyle scale in multiple design models

I have a file that has at least 10 different design models (i'm guessing they are design models-the properties shows 'design' and not 'sheet'). I think I know the answer but I would like other opinions and/or suggestions.

Is it possible to have different linestyle scales for each design model? I changed it because I was only working on 1 design model. The particular design model looked good but then I checked something in one of the other design models and realized I had changed ALL of the models linestyle scale. So I"m wondering if it's even possible to have different linestyle scales in 1 dgn file.

Microstation V8 2004 - Ver 08.05.02.56

Thank you