I'm having trouble imagining the purpose for this feature.
If you explain what you are actually trying to achieve, maybe a solution can be offered.
Extrude a smaller sized block to connect the bodies and in merge result of that block, select the bodies you want to join.
Deepak, thanks. That is already what I did initially. I am thinking if it is possible to do that without an additional feature. Well, thanks anyway.
There is no way u could do that,I think.Even if you export to neutral format and import it, U ll still have two bodies.