A 2nd example of a Temporary Table created 'on the fly' - and then 'dropped'. . . Table is unique to the User/Session.
Additional Code Examples

CREATE PROCEDURE sp_AppendProjFetTo_tmpTable  AS

--- Create Temporary Table *

CREATE TABLE #ProjAppendFet (

       MID smallint NOT NULL ,

       ModID smallint NOT NULL ,

       FtrID int NOT NULL ,

       ProjID smallint NOT NULL ,

       RevDate smalldatetime NULL ,

       LastUser varchar (12) NULL

ON [PRIMARY]

ALTER TABLE #ProjAppendFet WITH NOCHECK ADD

       CONSTRAINT [PK_ProjAppendFet] PRIMARY KEY  NONCLUSTERED

       (

                   [MID],

                   [ModID],

                   [FtrID],

                   [ProjID]

       )

 CREATE  INDEX [FtrID] ON #ProjAppendFet(FtrID

 CREATE  INDEX [MID] ON #ProjAppendFet(MID)

 CREATE  INDEX [ModID] ON #ProjAppendFet(ModID)

 CREATE  INDEX [ProjID] ON #ProjAppendFet(ProjID)

--- Append All Features from the Form Criteria

INSERT #ProjAppendFet

       (MID, ModID, FtrID, ProjID, RevDate, LastUser)

SELECT tblModelMar.MID, tblModelMar.ModID,

       tblFtrToProject.FtrID, tblFtrToProject.ProjID,

       tblProjectCriteria.RevDate, tblProjectCriteria.LastUser

FROM tblFtrToProject INNER JOIN

       tblProjectCriteria ON

       tblFtrToProject.ProjID = tblProjectCriteria.ProjID INNER JOIN

       tblModelMar ON

       tblProjectCriteria.ModID = tblModelMar.ModID

--- RIGHT JOIN will Check for Existing Records before Appending

INSERT INTO tblFtrToMod ( MID, ModID, FtrID, ProjID_S, RevDate, LastUser )

SELECT #ProjAppendFet.MID, #ProjAppendFet.ModID, #ProjAppendFet.FtrID,

       #ProjAppendFet.ProjID, #ProjAppendFet.RevDate, #ProjAppendFet.LastUser

FROM tblFtrToMod RIGHT JOIN

     #ProjAppendFet ON

     tblFtrToMod.MID = #ProjAppendFet.MID AND

     tblFtrToMod.ModID = #ProjAppendFet.ModID AND

     tblFtrToMod.FtrID = #ProjAppendFet.FtrID AND

     tblFtrToMod.ProjID_S = #ProjAppendFet.ProjID

WHERE

      (tblFtrToMod.MID Is Null) AND

      (tblFtrToMod.ModID Is Null) AND

      (tblFtrToMod.FtrID Is Null) AND

      (tblFtrToMod.ProjID_S Is Null)

--- * Table is unique to the User/Session and Dropped at end of Stored Procedure