A number of radio commands are not available in the standard radio menus that can be enabled through the in-game settings.
Some particularly helpful ones are: Bombsite A, Bombsite B, Need a drop and Sorry. “Need a drop” unfortunately does not have corresponding audio in CS:GO.
Settings -> Keyboard/Mouse -> Communication options.
Here you can set the keybinds for the following in-game message menus. Command Radio Message, Standard Radio Message and Report Radio Message. It is common to bind these 3 menus to z, x and c.
In order to change these menus to include the hidden radio commands you need to edit a file called “radiopanel.txt” which is found in ..\Steam\steamapps\common\Counter-Strike Global Offensive\csgo\resource\ui
You can see the code needed to include the hidden radio commands in the “radiopanel.txt” for download just below the picture. But, you can also just replace your original “radiopanel.txt” with this one.
The radio menus will look like this:
If you want to revert the changes you can replace the file with the “radiopanel-original” file.