The schematic system is based on the clipboard that is stored in the WorldEditGlobalizer plugin.
WorldEdit schematics can also be placed in the "plugins/WorldEditGlobalizer/schematics/" folder
WorldEdit schematics can be imported by loading it localy on the subserver with "//schematic load <name>". This schematic is now in your local clipboard, to upload it to the network you can wait or typing "/weg upload". After that you can use the "/weg schematic save <name>" command and save your current clipboard into a schematics file