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Hereby is used in connection with what is present with the speaker or what the speaker has just mentioned or the speaker's present words (i.e. the present document); thereby is used in connection with what is at a distance from the speaker or what has been mentioned by the speaker or by someone else.
If you want to use hereby, the sentence might be: The total amount specified in Appendix 3 Price Breakdown and Payment Plan is hereby attached to the Subcontract.