How to plant a bomb playing as counter-terrorists in CS:GO? - Special Forces
Always for such commands, the cheat mode is activated first. Enter sv_cheats 1 in the console and move on to the next command.
The console command mp_anyone_can_pickup_c4 1 after which the counter-terrorist will be able to raise the C4 bomb and plant it. Done, it remains to come up with an application for this.