Line type Scale - views (Forgotten more then I ever new)

I have searched through but unable to find an answer. Or perhaps, an answer I can understand.

In my model space, I want to draw a dashed line, this dashed line say has 10 segments.

Now, when I set up my sheet, I want to create a 2 viewports, one at 1:10 and one at 1:100 (say).

I want generic settings, so my 10 segment dashed line, appears as 10 segments in both those viewports. 

Effectivly, the time I spend in Model space, drawing and looking readable, I want, with no extra messingabout, to get this view in any viewport at any scale.

For the life of me, I cannot figure out how I used to do this.

If it makes a difference, X-Ref's are used. This is not a drawing in model space behind a sheet.

Cheers.....Q

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