Country tag for Yunnan is:
YUN
If you want play for Yunnan HOI4 you could use tag command:
tag YUN
To annex Yunnan in HOI4 you could use annex command:
annex YUN
To delete all Yunnan units you could use deleteallunits command:
deleteallunits YUN
To add interests on Yunnan you could use add_interest command:
add_interest YUN
To remove interests on Yunnan you could use remove_interest command:
remove_interest YUN
To start occupation on Yunnan you could use occupationpaint command:
occupationpaint YUN