The best replacement for schedule b is hts.

The best alternatives to schedule b are rated as following:
★★★★★  hts
★★★  hts number
★★  harmonized code
★★  harmonization code
★  harmonized tariff code
★  eccn
★  harmonized tariff schedule
★  hts code
  htsusa
  hs code

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Speaking about schedule b, one probably shouldn't forget about 941.

Other search terms related to schedule b and their ratings are:
★★★★★ 941
★★★★ 941 form
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hts
hts number