akshay@nio:/tmp$ cat infile
K00001 1 1 4 3 5
K00001 2 4 4 3 3
K00001 8 9 1 5 2
K00006 7 2 3 2 8
K00006 3 4 6 6 3
K00006 5 1 9 7 7
K00008 1 1 2 1 1
K00011 14 18 18 12 15

awk '
	function p(v, s)
	{
		for(i=2;i<=NF;i++)
		{
		  if(v == "push"){
			A[$1,i]+=$i
		  }
		  else{	
			if(($1,i) in  A)
			  s = (length(s) ? s OFS:"") A[$1,i]
			  delete A[$1,i]
		  }
		}
		return s
	}

 FNR==NR{ p("push"); next }

        { if(length(s=p()))print $1,s }

    ' infile infile

K00001 11 14 9 11 10
K00006 15 7 18 15 18
K00008 1 1 2 1 1
K00011 14 18 18 12 15

awk '{
	for(i=2; i<=NF; i++)
	A[$1,i]+=$i; 
	max = ( NF > max ) ? NF : max
     }
  END{
	for(i in A)
	{
	  if(i in A)
	  {
		split(i,X,SUBSEP)
		s = X[1]
		for(j=2; j<=max; j++)
		{
			if((X[1],j) in A)
			{
				s = s OFS A[X[1],j] 
				delete A[X[1],j]
			} 
		}
			
		print s
	  }
	}
     }'  infile

K00008 1 1 2 1 1
K00006 15 7 18 15 18
K00001 11 14 9 11 10
K00011 14 18 18 12 15