after you add the device, you can go into it's properties and add your own codes with unique names.  here you can learn new codes, or enter hex codes.

in the hardware section, click on the device tab

then click on the pencil icon

a box will open up, click on the functions tab, and the rest you should be able to figure out on your own.

you cannot copy codes from one device to another, which can be pretty annoying.

Also, keep in mind that each device has a list of advanced codes that can be accessed if you have an internet connection.  Click on the "Advanced Keys" button right below the pencil icon.  This might just have the disc codes you are looking for.

do yourself a favor and download the design guide.  it will be a huge help.