Changing Interior Cell Spawn Point

[BenChang]

How do I do this? 

 

I cloned x vanilla cell. Say it has 2 main rooms, A and B. You typically spawn in A upon executing the COC command. However, I didn't want to use A and as such I deleted it. 
 

Now every time my character spawns in the cell, they fall through the floor infinitely. How do I change the spawn point to stop this? Google has been especially unhelpful, turning up irrelevant results like all this nonsense: https://www.google.com.sg/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=skyrim+cell+interior+spawn&*

[Alter Native]

You can place a coc marker that specifies where you spawn in a cell when you coc in.

Just have a look at a vanilla cell and look for a blue "coc marker" or find it in the static section.