How to add a stimuli from a file to act on my circuit (i.e. i have a certain waveform and i want it to be a act as a source to a certain circuit) in cadence environment
Try vpwlf or ipwlf sources (Independent Piece-Wise Linear Voltage/Current Source Based on File).
Type "spectre -h vsource" for command-line help.
There: "you can read the waveform from a file. In this case, you give time-value pairs one pair per line with a space or tab between the time and the
value".