In the TE under the objects tab. When you highlight and save you end up with a file like below. It should save in the groups folder under ah3terr. I set down these three bridges so I could then set the group object down an additional 4 times to cross a canyon. Then I ran a view only road path across the span. Make one town or village, highlight and save as a group object repeated times. Be carfule about the size for FPS purposes.
bridge1.obg
F01BRR000, bridge1, 104.214, 2.945, -178.961, 0.0000, 0.0000,-1.5708, 3328, 0, 34, -1.00, -1.0, -1, 0, 0, 0, 0, 0
F01BRR001, bridge1, 104.517, 1.000, -577.932, 0.0000, 0.0000,-1.5708, 3328, 0, 34, -1.00, -1.0, -1, 1, 0, 0, 0, 0
F01BRR002, bridge1, 104.020, 1.000, -378.699, 0.0000, 0.0000,-1.5708, 3328, 0, 34, -1.00, -1.0, -1, 2, 0, 0, 0, 0