Hi nancyice
You should use anno feature if you what to scale the objects with the anno-scales.
A perfect example (metric units, sorry)
Architect floor plan with funiture.
Well created cad files useblocks for doors funiture and blocks for the room label. Also you have some text and dimensions.
Modellspace. You fit the scale for printing
the plan in 1:50. For that 1:50 plan you create the first layout.
A second Layout for Details display parts of the the floor in 1:10
A third Layout display the whole floor in 1:100 for a smaller paper, perhaps with less details.
Now you have nice Layout for 1:50,
But the Text, dimensions, roomlabels are too big in the Details Layout.
Or too small for 1:100.
Changing size for doors or chairs? That are real size objects, so the size have to be right depent of the scale.
In 1:1 the door is ~1m, 1:10 10cm, 1:50 2cm, 1:100 only 1cm
But the Text, dimension and the roomlabel blocks? I whould be nice they are in all scales in the same size comes to the plan/paper,
so you can use anno-feature for that.
The dimensions text is displayed in all viewports 2.5mm(for example), thats well.
And more. If the dimensions for inner walls are not set up for scale 1:100, they are invisible in viewport with anno scale 1:100.
Perhaps i use that as feature because i dont need so much details in plans who are smaller than 1:50.
It is only an example..
The scaling of hatch can be depant of annoscales too, or there is a feature for displaying an anno object allways with rotation 0
Thats nice for roomlabels for example when you rotate the view of the plan.
Read the other answers and links above, learning "all" about annotation feature is not a thing of only a day or a week.