CREATE PROCEDURE SP_COPY_LABELS
(
    @NAMESPACESOURCE int,
    @NAMESPACETARGET int,
    @FORCEOVERWRITE varchar(1)
)
AS
BEGIN

	DECLARE @LBL_NAME nvarchar(50)
	DECLARE @LBL_LANGUAGE nvarchar(50)
	DECLARE @LBL_VALUE nvarchar(max)
	DECLARE @LBL_MODIFIED_DT datetime
	DECLARE @LBL_MODIFIED_DT_TARGET datetime
	DECLARE @MyCursor CURSOR
	
	SET @MyCursor = CURSOR FAST_FORWARD 
	FOR 
		SELECT NAME, LANGUAGE, VALUE, MODIFIED_DT
		FROM LABELS WHERE NAMESPACEID=@NAMESPACESOURCE
	OPEN @MyCursor 
	FETCH NEXT FROM @MyCursor 
	INTO @LBL_NAME, @LBL_LANGUAGE, @LBL_VALUE, @LBL_MODIFIED_DT 

	WHILE @@FETCH_STATUS = 0 
	BEGIN 
		IF EXISTS (SELECT 1 FROM LABELS
			WHERE NAME=@LBL_NAME
				and LANGUAGE=@LBL_LANGUAGE
				and NAMESPACEID=@NAMESPACETARGET 
		)
			BEGIN
				SELECT @LBL_MODIFIED_DT_TARGET = MODIFIED_DT FROM LABELS WHERE NAME=@LBL_NAME and LANGUAGE=@LBL_LANGUAGE and NAMESPACEID=@NAMESPACETARGET
				IF @LBL_MODIFIED_DT < @LBL_MODIFIED_DT_TARGET OR @FORCEOVERWRITE='1'
				BEGIN
					UPDATE LABELS set VALUE=@LBL_VALUE, MODIFIED_DT=getdate()
					WHERE NAME=@LBL_NAME
						and LANGUAGE=@LBL_LANGUAGE
						and NAMESPACEID=@NAMESPACETARGET 
				END
			END
		ELSE
			BEGIN
				INSERT into LABELS ( NAME, LANGUAGE, VALUE, NAMESPACEID, CREATED_DT) Values ( @LBL_NAME, @LBL_LANGUAGE, @LBL_VALUE, @NAMESPACETARGET, getdate() )
			END

	FETCH NEXT FROM @MyCursor 
	INTO @LBL_NAME, @LBL_LANGUAGE, @LBL_VALUE, @LBL_MODIFIED_DT
	END 

	CLOSE @MyCursor 
	DEALLOCATE @MyCursor 

END

CREATE PROCEDURE SP_DROP_LABELS
(
    @NAMESPACETARGET int
)
AS
BEGIN

DELETE FROM LABELS WHERE NAMESPACEID=@NAMESPACETARGET

END

<script src="//code.jquery.com/jquery-2.1.4.min.js"></script>
<form action="~PROBE(100)~" method="POST" class="js-form">
<p>&nbsp;</p>
<p>Default functionality: the value of a label will be copied if values are different and the modified date of the source is before the modified date of the target
</p>
<p>
Source: <select name="NAMESPACESOURCE" id="NAMESPACESOURCE" class="js-namespace-source">
	<option value="">Select</option>
	<DIV CONTENTEDITABLE=FALSE ID=MACONTAINER MACONSTRAINT="" MAPARAMETER="NAMESPACES\ALL" MAHIDEDIV="true">
		<DIV CONTENTEDITABLE=TRUE ID=MAITEM MAHIDEDIV="true"><option value="~ITEM.ID~">~ITEM.ID~. ~ITEM.NAME~</option></DIV>
	</DIV>
</select>

Target: <select name="NAMESPACETARGET" id="NAMESPACETARGET" class="js-namespace-target">
	<option value="">Select</option>
	<DIV CONTENTEDITABLE=FALSE ID=MACONTAINER MACONSTRAINT="" MAPARAMETER="NAMESPACES\ALL" MAHIDEDIV="true">
		<DIV CONTENTEDITABLE=TRUE ID=MAITEM MAHIDEDIV="true"><option value="~ITEM.ID~">~ITEM.ID~. ~ITEM.NAME~</option></DIV>
	</DIV>
</select>
</p>
<p>
	<input type="checkbox" name="DROPANDREPLACE" class="js-dropandreplace" value="1" /> Drop and replace (beware!!)<br />
      <input type="checkbox" name="DROPANDREPLACE_UNCHECKED" value="0" style="display:none" checked>
	<input type="checkbox" name="FORCEOVERWRITE" class="js-forceoverwritechanges" value="1" /> Force overwrite changes - ignores modified date<br />
      <input type="checkbox" name="FORCEOVERWRITE_UNCHECKED" value="0" style="display:none" checked>
</p>
<p>
	<input type="submit" />
</p>
</form>

<script>
(function() {
    'use strict';


    $('document').ready(function() {
	$('.js-form').on('submit', function(e) {
		e.preventDefault();
		var source = $('.js-namespace-source').val();
		var target = $('.js-namespace-target').val();
		if (source !== '' && target !== '' && source !== target) {
			$('.js-form').eq(0).off('submit').submit();
		}
		return false;
	});
    });

}());
</script>