I am useing the imperial system, when I am in the layout trying to change the scale, onle the metric system appears By this I mean
etc.... What I want is 1/4 1/2 .......
it doesn't!!!!! I'll attach you the file!
its in layout, and I want to change the scale, I selected the viewport that is green, and I clicked properties, scale custom, or I also tried cicking below in the right corner and it can't!
Are we talking about Autocad or Revit.
If it is revit it will immediately update.
If it is while opening check if you have choosen only metric template layout will show only metric scale.
So, better open imperial template which has both metric and feet & inches template.
Refer image attached.
Hope this helps.....
Sorry for my language.
If it is Autocad, while opening choose imperial template which contains both metric and feet & inches scale.
Refer to the image attached in previous mail.
Otherwise you can add scales under
Option-User Preferences-Default scale fit-we can add whatever scale we require or reset default scale.
When i open your file, i am able to get both scales.
Hope this helps.