Just to put some flesh on the bones of Darrel's response.
You construct your CAD model, full size, as you have done. You then click View|Create View which prompts you to define a box around the area you want to print; this defines a View. After that you are prompted to assign a name to the view you have created. (Actually, you can use Views in many ways, this is one use.)
You then switch to Paper Space (It's the little tab at the bottom left of the screen, called Paper1. (This switches you to a paper space with the default name of Paper1 - you can have multiple paper spaces with names of your choice.)
In the paper space you then click Insert|Viewport when you are prompted to define a box the receive the view you want to print. Select the name you chose and it will then be inserted into the box.
If, when you enter paper space, there is something showing in the area, just click it to select it, and then delete it.
You can have several viewports and place them in several boxes on the same paper space. You can even have viewports with shapes other than boxes.
Viewports have "properties", one of which is the scale. If you select a viewport in paper space, right click and select Properties, you can examine and change properties such as hidden line, rendering, scale, etc.
TC21.2 x64 Plat, Bld59
TC16.2 Plat, Bld54.0