how can I hook up 10 speakers to my 4 channel car amplifier

[calvinbjackson4]

currently I have 4 speakers connected to the front channels and 4 speakers connected to the rear channels. I want to connect 2 more speakers.This is just for the front amp

 

[americanaudiophile]

If the combined impedance of all 3 speakers connected to each front channel amp is at or above the minimum impedance that the amp is rated for you are good to go.
If it is below that rating then you would need to a resistor in series with the speakers to raise the impedance up to the minimum. That non inductive resistor would have to have a power rating high enough not to burn up. That would depend on the power rating of the amp at that impedance.