That one doesn't exist to bad. Best is to use Destroy Technicals for that. You can make your own objectives in the bin file, but for multiplayer maps, only people who downloaded your map will be able to see then. So that works fine for single player, but not for multiplayer. So you will have to stick to the available objectives.
Also last night the penny dropped and i realised its your maps my mates like playing on my server MB Rail Yard and Hill Top etc. Oh and the and of course the HmS ones.