In plain English
FAR 52.247-45, F.o.b. Origin and/or F.o.b. Destination Evaluation, is a contract clause prescribed at FAR 47.305-2(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 47.305-2(b), insert the following provision in solicitations when offers are solicited on the basis of both f.o.b. origin and f.o.b. destination:
Prescribing reference: FAR 47.305-2(b).
The official text, verbatim
As prescribed in 47.305-2(b), insert the following provision in solicitations when offers are solicited on the basis of both f.o.b. origin and f.o.b. destination:
F.o.b. Origin and/or F.o.b. Destination Evaluation (Apr 1984)
Offers are invited on the basis of both f.o.b. origin and f.o.b. destination, and the Government will award on the basis the Contracting Officer determines to be most advantageous to the Government. An offer on the basis of f.o.b. origin only or f.o.b. destination only is acceptable, but will be evaluated only on the basis submitted.
(End of clause)