Fromsub- +‎chain.

subchain (pluralsubchains)

1. Anychain thatbranches off another.
2. A secondary or subsidiary chain of businesses.
   • 2009, Guillaume Gruère, Debdatta Sengupta,Biosafety Decisions and Perceived Commercial Risks, page 7:

     The supermarket chain may also have a retail partner orsubchain in the country subject to the same standard; this actor could further interact with policy makers.

• chain

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