setting more that one ground target for MDS

[steppie]

is there a way set more than one ground for MDS.
I have try a number of way but i keeping getting the same result.

what i am trying to do is have 4 to 5 truck convoys and some trains moving on the map but every time i set then up as a target destroy it select only one convoy so i do the same for the rest of the targets, i keeping red wins when only one convoy is train is destroyed. I tryed using the ground destroy targeting icon but this only ok as long as all the convoy stay in the radius of the ground target and this has a limitation to how large it gets.
How can i fix this problem