Retroactive Funding of OTAs/Contracts

Does anyone have experience handling retroactive application of grant funds? What is the process?

Is it possible to do the below but expand beyond grants? Can there be a Retroactive Application of OTA/Contract funding?

‘(B) RETROACTIVE APPLICATION OF GRANT FUNDS.—The Administrator may retroactively approve the use of grant funds under this subsection for projects to support the procurement, deployment, and sustainment of aviation security checkpoint and exit lane techBUR25619 958 6 S.L.C. 1 2 nology that were implemented on or after January 1, 2023.’

https://www.moran.senate.gov/public/_cache/files/a/2/a2b85b49-e818-4f77-8ae7-73ef63ffce0c/132D5065C13CE40E495FCB9BD1823862B1AE71A5322AE83169CA26F97BCF807B.moran-psf-text.pdf