Need to create a battle area and rebuild NavMesh. Save the scene and then build ZIP. In sandbox protal you need to upload zip file.
It sounds like that you haven’t edited team__score or team__capturePenalty in team entities (you can find them in Find Entity). Team will lose if score becomes 0. Property team__capturePenalty removes X score if team loses sector/point.
Is there any possibility of making decorative corpses on the map or something similar to them? I saw pieces of simple skeletons, but this is a little different.
Try to create dead soldiers entities? Like dev_dead_soldier. Property bodyCleanupTime let you edit time when body will automatically disappears. You also can kill soldiers if set hitpoints__hp = hitpoints__deathHpThreshold. You can a bit rotate them before kill.
You can select scene and click Right Mouse Button (RMB). After that select Copy. And then click on empty field on your folder using RMB and choice Paste.
Rename file (without .blk in name) and edit it a bit.