In other words Tongass goes between FTX and OpenLC (FTXCentral) (And RTMM on top).
Do this you are actually creating scenery blocks - then you can move things around as required inside the scenery blocks.
So top down:
3rd party add-ons block
RTMM Scenery: Libs go at bottom, add-ons scenery above.
FTX Block
FTX (ORBX) entries ... ORBX Entries (See FTX Central Discussion below)
Tongass Block
Tongass X Higher Priority ... from the Tongass X Installation (Higher goes above lower!)
Tongass X Lower Priority ... from the Tongass X Installation
OpenLC Block
ORBX!OPENLC (if you have it) (See FTX Central Discussion below)
Below is the bases stuff, mesh and default sim scenery.
To set up these blocks: set the FTXCentral insertion points.