Hi Amala, Unfortunately there is no functionality available for this out of the box. This would require custom javascript code to be able to set a dependency on one field, based on another field. This type of custom code is outside the scope of support, and would require a CA Services engagement to have this done for you. There may be other folks out here on the community that have done something like this and may be willing to share their custom code with you.
Thanks,
Jon I.