I have a technics SU-v500m2 amplifier connected via the aux input to my pc, i wish to link another amp to the same input, is this possible, and if so how?

Let's establish which is the IN and which is the OUT here. The PC is a Line Level source so its OUTPUT would feed one of the amp's Line Level INPUTs.

What's the second amp going to do in your scenario? Something other than the normal stereo channels; something multichannel (if your PC supports it); or just more speakers supported for the PC to feed?

An RCA Y-connector pair would share the stereo output of the PC with multiple Line Level destinations.

If a second amp with its own volume control is intended to share the same two channels with the SU-V500 it could also be slaved off the back of the SU-V500 wih an RCA patch pair exiting the Tape 1 or 2 REC(OUT) jacks. The second amp would receive full-volume audio from whatever source the SU-V500 is playing. Just don't activate the selected Tape monitor on the SU-V500 or you will cut off the source to both amps.

Take two wires (pc out to amp aux/line in). These are readily available in electronic mkt.Cut both wires from pc side leaving at least 3 or 4 inch space.Now peel all the four ends gently.Now separate the two core wire and the shield wire and twist them single each.Now use only one pin and other will be a spare.Now join the four outer mesh type wires with the mesh type wire of the pin.The rest of the wires are to be joined together in such a way that there are two wires for left channel and two for right.Now you can connect two amps from one output of pc.Note..... cover the ***** wires with insulation tape.