How can i enter unused tax credits amount transferred from a grandchild who is not a dependent ?

[TurboTaxSusan]

If you have a grandchild that is transferring a credit to you (such as tuition), then you would still add them as a dependant. This FAQ has more info on who can be claimed as a dependant: https://turbotax.community.intuit.ca/community/family-health/help/who-can-i-claim-as-a-dependant/00/...