What is the easiest way to subtract the signals in ADS?

What kind of signals do you use ? Different frequencies?, different phases?,different modulations? Different amplitudes ?

What are the differencies ?

I am working on WLAN receiver and my signals are I-Q signals,i want to substract
2 signals of output of polyphase filter

I want to subtract the output of the polyphase filter ....

please see the attacted file... named "polyphase filter.jpg"

Signals may be of different phase and different amplitude....

Please suggest me in each possibility i.e., ... in case of different phase, in case of different amplitudes and in case of when both occur...

please some1 help me ....

i need the solution urgently !