Hello, for the production of villas/duplex buildings, or basements (the first floor is regarded as the basement, and the second floor is regarded as the first floor)}, the following methods can be referred to:

Method 1. Build the indoor structure with columns and platforms;

For the indoor villa tutorial, please click: https://www.aihouse.com/global/study/detail/641 

Method 2. Draw the indoor structure using the free modeling function;

For the free modeling villa production tutorial, please click: https://www.3vjia.com/study/course/13f8271b915d4d07a39f3ab50b14d711

For the free modeling hollow duplex building tutorial, please click: https://www.3vjia.com/study/video?cid=10297&vid=d26aca780f8545768e047637ce39b990

For the villa exterior tutorial, please click: https://www.3vjia.com/study/search?t=1&keyWord=Villa

For the production method of duplex loft (new version), please click:  https://www.aihouse.com/global/study/detail/492