How do I apply for a reseal of a grant of Probate?

The Supreme Court of NSW provides a useful summary as follows:

“Usually a grant of probate or administration will be applied for in the appropriate Court of the state or country where the deceased person was residing when they died, which will usually be the place where most of the deceased’s assets that will need to be collected and distributed are located. In Australian states and territories the appropriate Court is the Supreme Court of the relevant state or territory. If a deceased person owned assets in more than one country it may be necessary to apply for a grant in each place where assets were located. However, if a deceased had assets in different states of Australia or in certain countries, namely Commonwealth countries where the Queen is the head of state, then it is possible to have a grant issued by a Court in one jurisdiction recognised in another state or country. This process of recognising the grant made in the other state or country is called resealing the grant. In NSW resealing of grants is permitted under section 107 of the Probate and Administration Act 1898 (NSW). Once resealed, the original grant will have the same effect and same operation in New South Wales as the original grant. The original grant of representation, an exemplification or a court sealed and certified copy of the grant must be produced to the Supreme Court of NSW for resealing.”

See link: https://supremecourt.nsw.gov.au/wills-probate/applications/reseal-of-grant.html