Hi @diegosales7HP9H,
As others have shown in their posts, this is actually quite easy to do. YOu can keep your model at 1:1 so it is easy to work with and with no conversions.
The place to set your scale is in paperspace. I made a video that shows your file. I create a new layout, assign a named page setup to establish papersize and some other plot characteristics. You will note that the plot scale is left at 1:1. This means the "paper" you see on the screen is a reflection of the real 1:1 paperit would plot on.
Once I apply th a pagesetup, I can then edit the scale list and add any custom scales. I added 1:200, 1:500, and 1:1000.
I show how once the scale is in the list, you can simply enter modelspace through your viewport and then apply the scale.
I emailed back your file to you for review.
Please select the Accept as Solution button if my post solves your issue or answers your question.
John Vellek
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