Add sub category to joined tables in Procedure in SQL Server

I have this procedure below that helps those in category A Admin to see their posts , with the query below if Admin Sky and Admin Blue is connected to each other in Category A group admin they will be seeing each others post.

A CATEGORY --------------------------

ALTER PROC [dbo].[GetUserPOSTS]
    @UserName VARCHAR (200)
AS
BEGIN


   SELECT profile.Name,profile.ImageName,profile.UserName,profile.UserVerifyStatus,
           post.Id,post.UserName,post.FriendUserName,post.ContentPost,post.Comments,post.FImageName,post.ImageName1,post.SendDate,
post.TotalCount,post.Path
		   
    FROM USERPost post
    INNER JOIN User3 profile ON profile.UserName = post.USERNAME,subb.USERNAME
	
    WHERE  post.USERNAME  IN (
	                    SELECT uf.UserName FROM FollowStatus uf
                        WHERE uf.UserName = @UserName AND uf.UserStatus = 'true'
                        UNION
                        SELECT uf.FriendUserName FROM FollowStatus uf
                        WHERE uf.UserName = @UserName AND uf.UserStatus = 'true'
						  UNION
                       
                        SELECT post.UserName FROM User3 post
                        WHERE post.UserName = @UserName 
						  
						
                      
                         )
                      
   
			
						
    ORDER BY post.Id DESC
	END

CATEGORY B SUB --------------------------------------------------

Now here is SUB catgory B Adim account here admins who are connected together will be seeing each others post

ALTER PROC [dbo].[GetUserPOSTSSUB]
    @UserName VARCHAR (200)
AS
BEGIN


   SELECT profilesub.Name,profilesub.ImageName,profilesub.UserName,profilesub.UserVerifyStatus,
          subpost.UserName,subpost.ContentPost
		   
    FROM SUBGROUPSpost subpost
    INNER JOIN User3 profilesub ON profilesub.UserName = subpost.USERNAME
	
    WHERE  subpost.USERNAME  IN (
	                   
                        SELECT sub.FriendUserName FROM Subgroups sub
                        WHERE sub.UserName = @UserName AND sub.UserStatus = 'true'
                         UNION
                        SELECT subpost.UserName FROM User3 subpost
                        WHERE subpost.UserName = @UserName 
						  
						
                      
                         )
                      
   
			
						
    ORDER BY subpost.Id DESC
	END


-----------------------------------

3rd stage join all Here i want to bring the two scripts on one procedure script so that the posts from the two categories can appear on one Datalist on page

ALTER PROC [dbo].[GetUserPOSTS]
    @UserName VARCHAR (200)
AS
BEGIN


   SELECT profile.Name,profile.ImageName,profile.UserName,profile.UserVerifyStatus,

profilesub.Name,profilesub.ImageName,profilesub.UserName,profilesub.UserVerifyStatus,
          subpost.UserName,subpost.ContentPost

           post.Id,post.UserName,post.FriendUserName,post.ContentPost,post.Comments,post.FImageName,post.ImageName1,post.SendDate,
post.TotalCount,post.Path
		   
    FROM USERPost post
    INNER JOIN User3 profile ON profile.UserName = post.USERNAME,subpost.USERNAME
	
    WHERE  post.USERNAME  IN (
	                    SELECT uf.UserName FROM FollowStatus uf
                        WHERE uf.UserName = @UserName AND uf.UserStatus = 'true'
                        UNION
                        SELECT uf.FriendUserName FROM FollowStatus uf
                        WHERE uf.UserName = @UserName AND uf.UserStatus = 'true'
						  UNION
                       
                        SELECT post.UserName FROM User3 post
                        WHERE post.UserName = @UserName 
						  
						
                      
                         )
                      
   
			
						
    ORDER BY post.Id DESC
	END

So far am stuck on this 3rd stage, any help