If these are eight wire motors, then they have four windings, in the pairs that you know about. The red/yellow are one pair, next is blue /black, (these make up the A and C windings) then white/purple and brown /green (these make up the B and D windings).
The A and C work together, and the B and D work together.
They can be wired up in series i.e. red - yellow connected to blue - black -- then the red and black are connected to A and A+
The other pair white - purple connected to brown - green -- then the white and green are connected to B and B+.
5 wire motors have a common, these do not.
In this configuration they are wired in series, and take the least current (but only provide half the power). You can also connect red to blue, and yellow to black for A and A+, and white and brown, purple and green to B and B+. This is parrallel wiring which takes more current, but provides more power.
My motors are Ghekos, wired to 20 Ncm motors, but the Gheckos can provide up to 7 amps. My motors are rated at 2.5amp per winding. In series they take less that 2.5 amps, but in parrallel they take 4. In your case I would wire them in series. If your drives are current limited, it does not matter, but it is better to start small and work up. Try that and see what happens.