How do I store a number on a DtermSeriesE 8 line NEC phone? Phone extension question?

I am trying to set up an extension on a line and I can’t figure it out. If any onecan clarify how they do it on any buzz it might help. I want my buzz to ring on muiltiple lines, Any sugestions?
Do I need to patch each extension in the patch room, or is it all programed on the buzz?

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