I've used LTspice for a long time but I've never made a subckt. When I google "create a LTspice subckt from a txt file", there are no clear steps showing how to do it.
One post said to first change the .txt extension to .subckt then click on some pull-down menu which is in an old version of LTspice and no longer there.
Is there a simple 1,2,3 steps in how to do this?
What I have is a .txt file of a subckt. It's a 4 pin device with several MODELs and SUBCKTs within.