An OpenType Collection (formerly known as TrueType Collection) file is one or more OpenType fonts combined into one file. The Extract Fonts from OpenType Collection Wizard, available from the Tools menu, can extract those fonts.

Source file
Select the OpenType Collection file.
Destination folder
The extracted font files will be saved in this folder.
Destination file prefix
The extracted files start with this prefix.

Here you will see all fonts available in the OpenType Collection. Select the fonts you want to extract and press the Finish button.