First:Can someone speak Thai?Because I'm not good at English.If can please post your e-mail (I use hotmail)or explan into Thai. or add me apocalysp_@hotmail.com

Second:Please answer my questions.

I would like to know Can I create the floating objects?If can.please tell me how to do that?

There is no special trick to create a floating object: export the mesh of e.g. a chair; in the 3d editor cut off the legs and reimport into the object: you have a floating chair

Or am I not understanding what you mean?

Uhmmmmm
Perhaps he means floating on water not on air......
In this case, usually, you have to edit the init bhav of your object to allow its placement on the water.
Even if you want, for i.e, a floating object (that usually is placed on other surfaces like terrain, counter, etc) on the air, you have to edit its init bahv to allow it in air.

So what do you mean exactly?
If is difficult for you to explain in English words, don't worry
Try with an example about what do you like to get.

Thanks for answer.But I'm not good at English so I wait for my brother.He can understands English language more than me.