Quote - Does the "Lock Actor" work for M4 as well? Cheers

As long as the actor names are the same, then yes. For example the code for the All_Locked pose goes like this:

actor BODY
    {
    locked 1
    }
actor hip
    {
    locked 1
    }
actor abdomen
    {
    locked 1
    }...

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OS: Windows 10 64-bit, Poser: 10