use time stamp value find Y value in another waveform

hello ,there, i am using labview 2013 sp1. sorry I can't use a photo to describe the problem.

Use DAQ assistant sampling 2 waveforms from 2 AI channels

Want to use rising edge of one of the waveforms as the triger to get the Y value of another waveform(just as did it with a oscilloscope)

I tried 2 method:

1. use <select signal.vi> to seperate one waveform out and use <search waveform.vi> to get the time of fits

2. also use <select signal.vi> and use <trigger and gate.vi+WDT get waveform time array DBL.vi> to get the time stamp.

is these method works?

the problem is how can i use the time value i got to fine the Y value in another waveforms?

thank you very much in advance.