If You've already import the furniture piece-by-piece (name are shown in italic), You could save all in a personal furniture library which could be loaded when needed.
1. Install the ExportToSH3F-1.0.sh3p plugin;
2. In menu: Furniture > Export imported furniture to SH3F...
Note: Sometime You need to make fine adjustment in PluginFurnitureCatalog.properties file.