How to Access Variable set based on Variable selection

[rajibosss11]

HI,

I have a doubt on this 

Catalog item variable name : Environment choices , prod,test,dev

variable set field : Server name : reference cmdb_aix_server 

When I select the Environment choice in the catalog variable, only the corresponding servers (Dev, Test, or Prod) should be available in the Server Name field. The reference list must be filtered based on the selected environment. 

[rajibosss11]

NO this was not working for variable set

[rajibosss11]

Hi,

Catalog variable field name : u_environment

select box: development,test.production

variable set Field name : server_list
lookup list: cmdb_rel_ci 
here i need to filter child list

and based on environment value i need to filter child server with environment filter 
if environment is development the this should only visible development servers in child list .
please some one suggest how to get this filter from Core catalog item variable to variable set.
thanks