In plain English
FAR 52.214-3, Amendments to Invitations for Bids, is a solicitation provision prescribed at FAR 14.201-6(b)(1), most recently dated Dec 2016. 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
This is a solicitation provision — it applies to offerors when submitting an offer, not to contract performance, so subcontract flowdown is generally not the operative question for it.
Where it's prescribed
As prescribed in 14.201-6(b)(1), insert the following provision:
Prescribing reference: FAR 14.201-6(b)(1).
The official text, verbatim
As prescribed in 14.201-6(b)(1), insert the following provision:
Amendments to Invitations for Bids (Dec 2016)
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(a) If this solicitation is amended, then all terms and conditions which are not modified remain unchanged.
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(b)
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(1) Bidders shall acknowledge receipt of any amendment to this solicitation-
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(i) By signing and returning the amendment;
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(ii) By identifying the amendment number and date in space provided for this purpose on the form for submitting a bid;
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(iii) By letter;
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(iv) By facsimile, if facsimile bids are authorized in the solicitation; or
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(v) By email, if email bids are authorized in the solicitation.
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(2) The Government must receive the acknowledgement by the time and at the place specified for receipt of bids.
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(End of provision)