how can I import two soldiers with out them merging
-so i import two mesh imperial officer and storm trooper I want to put the storm trooper body on the officer head , but each time both merg

Import the Storm Trooper in one scene and save it.
Start a new scene and import the officer
Export the officer geometry as obj
Import obj into Storm Trooper scene

how can i open obj this pops up and when imported its a null what options do i click? thanks

That import window looks fine, native obj export was disabled in Softimage Mod Tool 7.5, make sure you have this plugin installed:
http://www.si-community.com/community/v ... f=35&t=797

How to install Obj Exporter for Softimage Mod Tool 7.5:
1. Unzip Export_Obj.zip
2. Drag and drop Export_Obj.xsiaddon into a viewport
3. Restart Mod Tool

then try exporting the officer geometry again.