How to generate subckt file and device model

i am working on an EDA tool which takes subckt files and device model files of a cell (circuit) in CMOS form as input and characterizes it . Is there any way or tool that take schematic of the circuit as input and give me these files in spice format so that i can characterize it with my tool.?????

How to generate subckt file and device model

i am working on an EDA tool which takes subckt files and device model files of a cell (circuit) in CMOS form as input and characterizes it . Is there any way or tool that take schematic of the circuit as input and give me these files in spice format so that i can characterize it with my tool.?????