<Snipped quote by Silvan Haven>
We've only ever seen three types of Mold Magic (Ice, Memory, and Wood) so I'm not really sure where there is room in that to have separate classes within it. I think it's called Mold Magic but because it's not referred to often by name people have taken to calling it Maker Magic because whenever it's in use the caster shouts "(desired element) MAKE (desired form)!"
Caits character Sasha is labelled as having: Molding Magic, Ice so I'm not the only one aware of this.
"Ice-Make (氷の造形魔法, アイスメイク Aisu Meiku): A form of Molding Magic that allows the user to create ice at his will and to shape it into objects. In Gray's case, he uses Static Ice-Make, meaning he can shape his ice into inanimate things or weapons"
From Gray's wiki page.
"Currently, there are only three known types of Molding Magic: Ice-Make, Wood-Make, and Memory-Make."
From the Molding Magic wiki page.