How Can I save multiple records in same meta key?

This should work out of the box, as long as the “unique” parameter of add_post_meta() is false.

add_post_meta($id, '_dates', 2, false);
add_post_meta($id, '_dates', 3, false);
add_post_meta($id, '_dates', 4, false);

then somewhere else

$dates = get_post_meta($id, '_dates', false);

Now $dates should be an array of your 3 values.

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