[phenixbb] Bond to symmetry mate

Dear phenixbb, I am sure this is a trivial problem encountered before and that there is a solution to it ­ however, I was unfortunately not able to solve it myself or with the help of the online documentation. The problem: In one of my structures a nucleic acid chain extends over several symmetry mates. How can I create and refine a bond (in my case 5'-phosphate to 3'-end ) to that symmetry mate? Many thanks in advance Eike