how do I create a custom scale size?

1. Press the Copy tab.

2. Press the Scale button (or the Tool button if Setup tab > Options > Quick select lists is selected).

3. In the Scale Setup dialog, press the New button.

4. Set a name for your new scale.

5. Press the Value button and set the scale value.

6. Press the Save button and then OK to confirm.

Your new scale will join the standard scales in the Scale presets list.