How to use user_skin_mod.xml with common skins?

[birdman]

Sorry just tried again, what I need to do is use the name of the skin ie skin_user_YouViX-Blue.xml although it would be good if we could use a user skin mod for common folder then we wouldn't need multiple mod files for each YouViX skins.

The whole point about the naming is that it allows you to have multiple overrides present at the same time, one for each skin you are using.
If you want to have a skin_user_YouViX-Common.xml (presumably just to contain overrides for YouViX-Common code), then just end your skin_user_YouViX-Blue.xml (and skin_user_YouViX-Pink.....xml) with:

<!-- ALL includes must be in this file!
     The include code doesn't handle includes in includes.
 -->
<include filename="/etc/enigma2/skin_user_YouViX-Common.xml">
        
</skin>