DECLARE @idoc int;
DECLARE @doc xml;
set @doc=cast('<Root><item><ProjID>'+replace(@SelectedProjectArray,',','</ProjID></item><item><ProjID>')+'</ProjID></item></Root>' as xml)
EXEC sp_xml_preparedocument @Idoc OUTPUT, @doc

SELECT ProjID FROM OPENXML (@Idoc, '/Root/item',2)
WITH (
[ProjID] varchar(10)
)