I am trying to find a generalized Instrumentation amplifier component on LT Spice, since I want to import a new In-amp library.
But I am unable to find it.
Please guide me.
It would be surprising if ADI's support pages did not have one
symbol / model for their raft of LT and ADI amplifiers. And the
LTWiki / Yahoo group repository. I can only believe you have
not tried. Or even Googled.
Halfway down the first page of hits for "ltspice instrumentation
amplifier":