You can make an underground template for quicker underground building. In order to make such a template, you need to place the structure underground while editing it and activate Record Block Removal. With this option active, any block removal you do will count result in the new air block being added to the template. Any block placement will result in the air block being removed from the structure template.

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The user could access a template from StructureTemplate for faster underground building.

1. Create a new world with Structure Templates activated.
   
2. Press f1 to open the command prompt
3. type give structuretemplateitem in the command line.
4. User will receive a template tool.
   verify: a white tool with a bold T appears.
   
5. Press ESC to get out of the command line.
   
6. Right-click to Place the template on the ground.
   
7. Press E while pointing at the template to open menu.
   verify: Menu with record block removal will appear.
8. Press Esc to exit.

1. Click E while pointing to the origin.
   
2. Select Record Block Removal.
   
3. Start removing blocks by right click.
   
4. As you remove blocks, the air blocks are added to the template
   Verify: You can see a structure being formed surrounded by a white line.
   
5. Once you are happy with your structure, go to origin and open menu.
   
6. Select Copy->clipboard, paste it and save the json code in the prefab of the mod.
   
7. go back to the game and select Create Structure Spawner.
   Verify: user receives a white tool.
   
8. press esc to exit from the menu.
   
9. right click to place the structure to create the underground.