BGP Advertisement to Specific AS Number

HOw to setup BGP so it will not get advertised to specific AS.
Example:
My BGP AS 1000 and i peer with AS 2000 and 3000. I want to tell BGP AS 2000 not to advertise to AS 100, and 200. 
Or i want to advertise my blocks to all internet but i want to make sure AS 100 and 200 wont have my prefix in the BGP table.
thanks

Hello,
 Create a "peer-group" where you will add those two AS to the peer-group. And apply "mhnedirli" solution above...
and use : 
neighbor <peer-group-name> route-map BLOCK out

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