Combining suitcases: To merge all the fonts from one suitcase with another, drag one suitcase on top of the other. All the fonts from the dragged suitcase will go into the other, and the dragged suitcase will disappear.
A suitcase can also contain fonts from different font families, although you should keep all fonts of the same family in the same suitcase. All the fonts will still appear in menus with their proper names.
You treat a suitcase as you would a folder. To open a suitcase, you double- click it. To add a font, you drag the font’s icon to the suitcase and drop it in. To remove a font, you drag its icon out of the suitcase.
To create a font suitcase, duplicate an existing one and throw away its contents. Then rename the suitcase as appropriate and drag whatever fonts you want into it.
Size limits for suitcases: No matter how many fonts you have in a single suitcase, the Fonts folder counts the suitcase as a single unit. There’s no limit to the number of fonts in a single suitcase, but the suitcase cannot be larger than 16 megabytes.