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I'm going through the powerscore bible and I've read that you can not reverse "Most/All" Statements

For example:

A------> B or A---Most---->B can not reverse, while G<---Some--->Not H reverses to Not H<---S--->G

From there, let's take A---Most--->B
Can't I infer that A<---S--->B and reverse that statement to be B<-----S----->A?

Likewise Can't I reduce a-----> b to A---Most--->B and follow the same steps there?

You can reverse most statement to some statements. You just can't reverse them as most statements.

You can reverse all statements to some statements, assuming the original thing exists. For instance, you can't reverse:

Unicorn --> Horn

Because we have no proof that unicorns exist.

Thanks! I have one more question
COuld you explain why, for a situation like V-----Most--->W <------X would not lead to V<----Some---->X if you reduce W<----X to some?