Easy way
<msg id="skill0460" cont="Gm Buff Lv.1" />
<msg id="skill0461" cont="Gm Buff Lv.2" />
<msg id="skill0462" cont="Gm Buff Lv.3" />
<msg id="skill0463" cont="Debuff of Gm Buff " />
add new Skillbook ID in item.dec/scp
Excample
<msg id="item3722" cont="Skill Book (GM Lv.1)" />
<msg id="item3723" cont="Skill Book (GM Lv.2)" />
<msg id="item3724" cont="Skill Book (GM Lv.3)" />
<msg id="item3725" cont="Skill Book (Debuff GM)" />