@Stefan Schippers Hi Stefan, I am designing a VCO that has a spiral inductor (750pH). I haven't found anything regarding spiral inductor in sky130 pdk. Any suggestions/idea how to implement spiral inductor in xschem using sky130 would highly be appreciated.

A spiral inductor is usually modelled with an equivalent circuit. You create a schematic using ideal components (R,L, C) and then create a symbol for it with 2 pins corresponding to the inductor terminals. The difficult part is getting the equivalent circuit using ideal R,L,C (and may be others, like transformers, controlled sources etc). Usually a field solver is needed for this. You draw the geometric representation for the inductor, provide details for conductor (height, resistivity) dielectrics and more and the field solver will provide an approximation of the electrical behavior using circuit elements.