Unfortunately, I don't have a import script example.
Most asset data is in tblAssets and most asset data related tables are also linked to that table. If you have a test environment you can try creating the script by using our database documentation. If you can't find the database dictionary, there is a guide here: https://www.lansweeper.com/forum/yaf_postst9870_Lansweeper-database-dictionary.aspx
Obviously I would not advice trying this in a production environment. Issues related to custom database modifications are not supported by our support team. If need be, you can find a guide on how to create a full backup of your Lansweeper installation here: https://www.lansweeper.com/kb/94/backing-up-your-installation.html