This command adds (despite the name, it doesn't not set) the specified amount to your target's bounty with the specified faction. Use 'player.setcrimegold' to add to your character's bounties.
setcrimegold [amount] [faction id] Target Command
|Amount||The amount to add to your target's bounty.|
|Faction ID||The faction ID of the faction that the bounty is with.|
setcrimegold 10 000267EA
Crime Faction Whiterun has a faction ID of 000267EA. This command adds 10 to the current bounty your target has with the Whiterun faction.
player.setcrimegold 10 000267EA
This console command is similar to the first example, but as the 'player.setcrimegold' command is used, the amount is applied to your character's bounty (and not that of your target).