Wiring 2 dual 4 ohm to 1 ohm

[shalizi 10+ year member]

i saw the diagram on fosgates website and i have a question, when you parallel the negative side on the first sub are you going to put one parallel wire on the negs and then have one more wire in the bottom in the same input place on the sub which will go to the negative of the other sub? im talking about the wire from the neg to the other subs neg:*******:

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[hemi=22s 10+ year member]

you dont have to u can run a seperate wire for each sub negativ to the amp