Here are the requirements from the LTO Website:

Documents Required
1. Original Certificate of Registration (CR) and latest original Official Receipt (OR) of payment
2. Release of Chattel Mortgage Contract duly cancelled by the Registry of Deeds
3. Official Receipt (OR) of payment of release with the Registry of Deeds
4. Actual inspection of MV with duly accomplished MVIR [Download this form here]
5. Confirmation of CR/OR (CIR-91-137) if issued by other LTO Agency
6. Taxpayer's Identification Number (TIN)
I'm done with the Registry of Deed items.

My question is: Can i have this process of cancellation of mortgage done in any LTO branch?