I am using a plug-in called Transcript but it seems that it can not be obtained, so I will show an alternative.
Vertex morph inversion can be realized by using plug-in TransMorph.
https://tark.sakura.ne.jp/log/metasequoia/transmorph/

1) Make an object that is the base of the morph by duplicating the copy button on the object panel.
2) Edit the vertex position on only one side of the duplicated object.
3) Start the plug-in TransMorph with the base object selected in the object panel.
The panel setting at this time is
Morph left and right turn on
Only list element elements Off
The setting of the lowest row is on only coordinates
Press the OK button with the above setting.
4) Inverse replicated morph object is created.

It is inconvenient that there are no functions such as inverse duplication of morphs or copying of partial morphs, so it should be realized with the function of the metasequoia body.



私のところではTranscriptというプラグインを使っていますが入手できないようなので代案を示しておきます。
頂点モーフの反転複製はプラグイン TransMorph を利用することで実現できます。