Hello Senthil,
You need to find a positive qty stock and move it onto this storage bin. If they match, they will negate each other.
For your next question, negative stock is allowed at LIME section, SCM Basis. Goto: IMG: SCM Extended Warehouse Management >> SCM Basis >> Logistics Inventory Management Engine (LIME) >> Basic Settings >> Application-Specific Settings >> Determine Global Customizing Settings for Each Client.
As far as i remember, this is allowed in standard.
Best regards
Serhan