How to Separate portion of Mesh along a line?

I’m Trying to get this

to do this
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You have to duplicate your selection and then:

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There’s not really a clean way to do this with what you currently have. You could use V to rip the selected seam, and then separate the two halves, but realistically, if you want something like that, then you need to have a model with the topology to allow for it; Or, have a separate object for the part that hinges.

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@Magnavis\rigoletto Ty this helps.