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RAHMAN HASHMIRAHMAN HASHMI 

i have a picklist value 'committee member',if committee member is selected then checkbox need to come into picture not for other vslues

Devi ChandrikaDevi Chandrika (Salesforce Developers) 
Hi Rahman,
If you want to make a field visible after saving the record  use workflow field update to change record type .Add this checkbox field to page layout and associate this layout to you new record type.
Please refer below links which might help you in this
https://success.salesforce.com/answers?id=90630000000CnZrAAK
https://success.salesforce.com/answers?id=9063A000000DiuOQAS

Hope this helps you
If this helps kindly mark it as solved so that it may help others in future.

Thanks and Regards