Hi Banban

Probably you moved / changed the tab of the objects.
Try this
- Start with the first level, in the first tab (Foundation) and go over the following tabs (Floor, Electrical, etc)
- Repeat the process in the second and third floors, with all the tabs

In addition, in Punch AS 4000 you can use the 3D selection tool (arrow icon in the lower right corner in Live view).
You can select items just on the active floor. So, if you click in the chair and it doesn't become active in the plan, try with other level.
I suggest to work with liveview / half view so you can control the plan and the live view at the same time
If you don't find the object, zip your plan and send it to me

Hope this helps

Patricia