In plain English
FAR 52.247-46, Shipping Point(s) Used in Evaluation of F.o.b. Origin Offers, is a contract clause prescribed at FAR 47.305-3, 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 47.305-3 (b)(4)(ii), insert the following provision in f.o.b. origin solicitations when price evaluation for shipments from various shipping points is contemplated:
Prescribing reference: FAR 47.305-3.
The official text, verbatim
As prescribed in 47.305-3 (b)(4)(ii), insert the following provision in f.o.b. origin solicitations when price evaluation for shipments from various shipping points is contemplated:
Shipping Point(s) Used in Evaluation of F.o.b. Origin Offers (Apr 1984)
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(a) If more than one shipping point or plant is designated by the offeror and the offeror fails to indicate the quantity per shipping point or plant before bid opening, the Government will evaluate the offer on the basis of delivery of the entire quantity from the point or plant where cost of transportation is most favorable to the Government.
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(b) If the offeror, before bid opening (or the closing date specified for receipt of offers) fails to indicate any shipping point or plant, the Government will evaluate the offer on the basis of delivery from the plant at which the contract will be performed, as indicated in the offer. If no plant is indicated in the offer, the offer will be evaluated on the basis of delivery from the Contractor’s business address indicated in the offer.
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(c) If the offeror uses a shipping point other than that which has been used by the Government as a basis for the evaluation of offers, any increase of transportation costs shall be borne by the Contractor and any savings shall revert to the Government.
(End of clause)