Use "here" more, "There" , "The prefix such as Where" :
Hereafter = After This Time; henceforth
Hereby = By Means/reason Of This; hereby
Herein = In This; in this, hereat
Thereinafter of Hereinafter = Later In This Contract;
After this of Thereafter = Afterwards; , later
Thereby = By That Means; because this; From this; In that respect
Therein = From That; is over there; Go up in that bit
Thereinafter = Later In The Same Contract; is the following; Thereinafter
Whereby = By What; By Which; by be; By that
Where is Wherein = In What; In Which; ; Go up in where dot

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