As per the Canada Revenue Agency (CRA): Transferring the credit 

If the person with the impairment does not need the entire disability amount to reduce their income tax, they may transfer some or all of the disability amount to the supporting family member who is identified on the DTC application form (Part A question 2).

Who qualifies as a supporting family member

If the supporting family member who wants to claim the credit was not identified on the initial application, they can submit a written request to the CRA for the transfer. This request must be signed and include details of the support they provide for the basic necessities of life.

For guidance, please see our TurboTax FAQ How do I claim the Disability Tax Credit transferred from my dependant?

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Thanks for the reply but this doesnt help. I'm aware of all of this.

Are you transferring from a spouse or from a dependant? If you are transferring from a spouse are you preparing your returns together? If you are transferring from a dependant, have you checked on your spouse's return (if applicable)?