In plain English
FAR 52.232-19, Availability of Funds for the Next Fiscal Year, is a contract clause prescribed at FAR 32.706-1(b), most recently dated Apr 1984. The complete official text is reproduced below, verbatim, from GSA's published FAR source files.
Its text contains no sentence requiring insertion into subcontracts; see the flowdown section below for what that does and does not mean.
Does it flow down to subcontracts?
No flowdown mandate found in the clause text
We scanned the full clause text and found no sentence directing the contractor to insert this clause into subcontracts. That is a statement about the text, not legal advice: a prime contractor may still flow terms down contractually, an agency supplement (DFARS, VAAR, …) may add requirements, and clauses listed below (if any) may order this clause into subcontracts from the outside.
Where it's prescribed
As prescribed in 32.706-1(b), insert the following clause:
Prescribing reference: FAR 32.706-1(b).
The official text, verbatim
As prescribed in 32.706-1(b), insert the following clause:
Availability of Funds for the Next Fiscal Year (Apr 1984)
Funds are not presently available for performance under this contract beyond ________. The Government’s obligation for performance of this contract beyond that date is contingent upon the availability of appropriated funds from which payment for contract purposes can be made. No legal liability on the part of the Government for any payment may arise for performance under this contract beyond _____, until funds are made available to the Contracting Officer for performance and until the Contractor receives notice of availability, to be confirmed in writing by the Contracting Officer.
(End of clause)