Use this code to get the different ports then use delete_line and add_line to arrange them
b=get_param('untitled/yoursubsystem','PortConnectivity')
n=numel(b) % number of blocks connected to block1;
out={};
for k=1:n
s=get(b(k).SrcBlock); % search for source blocks
if ~isempty(s)
out(end+1,1)={'Source'}
out{end,2}=s.BlockType;
out{end,3}=s.Name
end
end
