Vehicles are automatically copied to the Pool when they are driven, but you may want to edit a vehicle before driving it, or indeed build your own library of frequently used vehicles.
To copy a vehicle to the pool, select it, drag it over the Pool symbol and drop it. If you wish to copy it to another library you will need full access rights in the destination library. The cursor will change to a no entry symbol to indicate areas where you cannot drop the vehicle.
You can also make copies of vehicles within libraries in the same way; in this case the names of the vehicle and its units are prefixed with the words 'Copy of ', to distinguish them from the originals. If you drag a vehicle to a new group within the same library it will be moved (not copied). If you want it to be copied, hold down the <Ctrl> key while you drag. This functionality is consistent with normal behavior in Windows Explorer.
Units can be copied in the same way, but can only be copied to another vehicle. Select the unit and drag and drop it over the required vehicle. The unit will be added to the end of the vehicle but can be moved forward by editing the vehicle details.
Entire vehicles can also be added to the end of other vehicles in the same way. In this case all the units that make up the dragged vehicle are added to the end of the target vehicle.