Trying To Enter More Than One Selected Value Into One Column In The Database.

Hi i am trying to enter more than one value into my constructor field in my database, at the moment when the values are entered into the database through the front end, they appear in the database as seperate records however they have the same ID,  the only thing that changes is are the data in the fields which i want in just one. This is the part of the stored procedure I am sure is causing this to happen;

IF @Access_Right_ID=8  or @Access_Right_ID=3  or @Access_Right_ID=9
   BEGIN
     DECLARE @Delimiter char(1)
     SET @Delimiter = ','
     DECLARE @CommaPos int
     SET @CommaPos = Charindex(@Delimiter,@Constructor_IDs)
  
     DECLARE @Remaining_Constructor_IDs VARCHAR(8000)
     SET @Remaining_Constructor_IDs = @Constructor_IDs
  
  
    
    DECLARE @Constructor_ID int
  
                   WHILE (@CommaPos>=0)
     BEGIN
     

     SET @CommaPos = Charindex(@Delimiter,@Remaining_Constructor_IDs) 
  
     
     if   @CommaPos >0
     
      SET @Constructor_ID = ltrim(rtrim(Substring(@Remaining_Constructor_IDs,1,@CommaPos-1)))
     
     else
     
      SET @Constructor_ID = @Remaining_Constructor_IDs    
          
     
     INSERT INTO tblUser_Constructor
     ( User_ID,  Constructor_ID)
     VALUES
     (@User_ID, @Constructor_ID )
    
     SET @Remaining_Constructor_IDs = SUBSTRING(@Remaining_Constructor_IDs,@CommaPos+1,LEN(@Remaining_Constructor_IDs)-@CommaPos)
     
     if @CommaPos=0
      set @CommaPos = -1
     
     END