In your: \Arma 3\@epochhive\addons\a3_epoch_server_settings.pbo are the different maps...
unpack the pbo and open \configs\maps MAPUWANTTOEDIT.H [ It is divided into the different maps. (Stratis, Altis, Cherno, add more if u need ...) ]
Example:Altis.H start with:
propsPos[] = { //in the propsPos you can add houses, atm, waterbarrels or everything you want. just....
propsPos[] = {
//trader city #1
{"Land_MarketShelter_F", { 13315.3, 14512.4, 0.0361125 }, 119.966},
{ "Land_ScrapHeap_2_F", { 13315.9, 14499, 0.00584948 }, 255.706 },
{ "classnameyouneed" , { X , Z , offsetY }, azimut } // add more if u wish, but the last one without comma
Important is only the last batch may not a "comma" so, look at the "," at the end from the line.
Build what you want with the A3 Editor, save coordinates for your cpp (press "copy Epoch CFG to Clipbord"), then past this in a empty txt file, or directly into the cpp.
*with the custom pbo you can specify more features, such as set vector and so
Repack the .pbo and ready
*If you want to build with the MCC Sandbox Tool or Zeus, save with MCC Sandbox (press "save all sqm"), then convert the coordinates and add this into the cpp. (Use the Mission converter)*
The coordinates:
useful tools and links: