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Eden is the current default 3D mission editor for ArmA 3. It can be used for object placement which are imported to Terrain Builder.

Place objects normally. You'll find objects under Props icon in the right hand side panel.

Export objects by File → Export to terrain builder, then copy CTRL-C and paste CTRL-V that to a text file, then import this text file into terrain builder by file → import → objects.

See also Beginner Eden Editor Object Placement Tutorial and github [E2TB] Export to Terrain Builder

Feel free to ask questions or send feedback in PMC Tactical forum "ArmA 3 Beginner Eden Editor Object placement Tutorial" topic.

Used CUP, ZEC and ZECCUP addons to place eden mission editor compositions, created some military bases for PMC 51km Desert terrain. Exported objects from eden and tried to import into terrain builder but had missing Terrain Builder Template Libraries. Some odd a3\ objects I never though of using.

Then used ObjectPlacementTBH and loaded the mission, in “add existing objects” menu I got the military base objects added into objectplacementtbh, then it was just regular saving project and exporting to terrain builder.

There was few objects that gave some error, maybe they were the same as missing from terrain builder template libraries I don't know.

Imported to terrain builder just fine and got project WRP exported.

I'm not sure if the core issue was my lacking template library TML files because I use same everywhere, I don't use the TML's that come from steam workshop objectplacementtbh download. I always delete the projects dir contents as its such WW2 etc stuff.