The 8 wire is just like a 6 wire, but instead of just taking out 1 middle tap, it takes two separated ones, and breaks the big coil in two smaller ones, unconnected. If you short the medians back together, you end up with a 6 wire and you can ignore the middle tap and use only extremities.
For those name wires you may need to short A2-B1 to make first coil A1-A2-B1-B2. Then short C2-D1 which gives second coil to be C1-C2-D1-D2.
Now because each have certain position inside motor, cant just link the coils any way we want to, the pairs have to be correct ones, and with correct direction each. So it is important also the direction to which the current travels into each half coil, so using A1-A2-B1-B2 is not the same as A1-A2-B2-B1. Because the spin rotation of the coils have to be consistent. There is just only one way to form correctly the bigger two coils from the 4 smaller ones. At which point the motor datasheet helps.
For those name wires you may need to short A2-B1 to make first coil A1-A2-B1-B2. Then short C2-D1 which gives second coil to be C1-C2-D1-D2.
Now because each have certain position inside motor, cant just link the coils any way we want to, the pairs have to be correct ones, and with correct direction each. So it is important also the direction to which the current travels into each half coil, so using A1-A2-B1-B2 is not the same as A1-A2-B2-B1. Because the spin rotation of the coils have to be consistent. There is just only one way to form correctly the bigger two coils from the 4 smaller ones. At which point the motor datasheet helps.