[Q] Link internal storage to external SDcard

Samsung Galaxy S Duos 7562 has its internal storage sdcard0 shared with data partition. As the sdcard0 fills up the space to install apps reduces causing insufficient space to install error. If I delete files from sdcard0, I can install apps. Whatsapp by default saves its media files on internal storage even if there is an external SDcard.
My question how do I create or link the whatsapp folder from sdcard0 to ext_sdcard. Tried formatting ext_sdcard to ext2 and ext4 filesystem. But SD card was not recognized. Can this be achieved without rooting the phone?
Or root it once than unroot it back?
Person using is not tech savvy so possibility of creating problem or misusing root access.

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