How to transfer poses made with Common rig from 3.0 to 2.7?

Just mini tips.
Convert a pose created by parenting Common rig like the one described here to 2.7 file to bring it into in-game.

Okay, here we go.

How to convert Sim4 rig into Common rig

The Sims4 rig has a different shape than the rigs used in other common games.

Here I will write a very simple way to convert it to a common rig step by step. This entry is only about poses (body), I'm not going to write about facial expressions because I'm not familiar with it yet myself.

(I'm using Blender 3.0 here, but it's almost the same in 2.7)

(Blender 3.0 has added some useful features, especially "Local Space (Owner Orientation)" is much convinience for converting poses/animations from others, so it may be good to go get used to it.)

(However, there is a change in the save format from Blender 2.7 which supports Sims4Studio, so you need to be careful. I will write about it at the last)

Okay, here we go!