Are you saying you want to connect one guitar into a few amps at the same time and record them?
If that's what you are saying then it's a little more complex then you might think.
A lot of well known guitar players have done that, like Hendrix, Clapton SRV and many others.
The first question would be are they all similar amps?
Just because you might be hooking up a few Fender tube amps doesn't mean it's going to work. They might be out of phase, because of preamp stages. Then there are ground loop problems that might require removing a ground from the input cable.
Once those problems are solved you can get into the whole mic'ing thing.