@Stefan Schippers also for pulse waveform which one to use ? Or we use the vsource and edit the voltages as : PULSE ( V1 V2 TD TR TF PW PER PHASE )

Yes you are correct

@Ryan R for pulse, pwl, sin just use the standard voltage source,

vsource.sym

. you set the '`value`' attribute accordingly (complex expressions inside quotes, like:

value="pwl 0 0 1u 0 1.01u 3"

). The

vsource_pwl.sym

has been created because it has a completely different netlist syntax. It has 2 additional control nodes and a set of numbers that represent the polynomial coefficients.