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>How it can be possible to Add/Remove Some menu Items (like PAD, BAR etc.) programatically (while application is running)

See DEFINE PAD and DEFINE BAR statements

>Again Is there any way to renumber the Prompts of a menu popup.

Not sure what you mean

>Also Is there any provision to hide a Bar from the menu popup or Hide a Pad from the Menu bar.

You can disable PAD/BAR with SKIP FOR clause or remove with RELEASE BAR/PAD command but they cannot be hidden.